1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "tree-inline.h"
50 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
52 { NORMAL, /* Ordinary declaration */
53 FUNCDEF, /* Function definition */
54 PARM, /* Declaration of parm before function body */
55 FIELD, /* Declaration inside struct or union */
56 BITFIELD, /* Likewise but with specified width */
57 TYPENAME}; /* Typename (inside cast or sizeof) */
60 /* Nonzero if we have seen an invalid cross reference
61 to a struct, union, or enum, but not yet printed the message. */
63 tree pending_invalid_xref;
64 /* File and line to appear in the eventual error message. */
65 const char *pending_invalid_xref_file;
66 int pending_invalid_xref_line;
68 /* While defining an enum type, this is 1 plus the last enumerator
69 constant value. Note that will do not have to save this or `enum_overflow'
70 around nested function definition since such a definition could only
71 occur in an enum value expression and we don't use these variables in
74 static tree enum_next_value;
76 /* Nonzero means that there was overflow computing enum_next_value. */
78 static int enum_overflow;
80 /* Parsing a function declarator leaves a list of parameter names
81 or a chain or parameter decls here. */
83 static tree last_function_parms;
85 /* Parsing a function declarator leaves here a chain of structure
86 and enum types declared in the parmlist. */
88 static tree last_function_parm_tags;
90 /* After parsing the declarator that starts a function definition,
91 `start_function' puts here the list of parameter names or chain of decls.
92 `store_parm_decls' finds it here. */
94 static tree current_function_parms;
96 /* Similar, for last_function_parm_tags. */
97 static tree current_function_parm_tags;
99 /* Similar, for the file and line that the prototype came from if this is
100 an old-style definition. */
101 static const char *current_function_prototype_file;
102 static int current_function_prototype_line;
104 /* The current statement tree. */
106 static GTY(()) struct stmt_tree_s c_stmt_tree;
108 /* The current scope statement stack. */
110 static GTY(()) tree c_scope_stmt_stack;
112 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
113 that have names. Here so we can clear out their names' definitions
114 at the end of the function. */
116 static GTY(()) tree named_labels;
118 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
120 static GTY(()) tree shadowed_labels;
122 /* Nonzero when store_parm_decls is called indicates a varargs function.
123 Value not meaningful after store_parm_decls. */
125 static int c_function_varargs;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement that specifies a return value is seen. */
130 int current_function_returns_value;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement with no argument is seen. */
135 int current_function_returns_null;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a call to a noreturn function is seen. */
140 int current_function_returns_abnormally;
142 /* Set to nonzero by `grokdeclarator' for a function
143 whose return type is defaulted, if warnings for this are desired. */
145 static int warn_about_return_type;
147 /* Nonzero when starting a function declared `extern inline'. */
149 static int current_extern_inline;
151 /* For each binding contour we allocate a binding_level structure
152 * which records the names defined in that contour.
155 * 1) one for each function definition,
156 * where internal declarations of the parameters appear.
157 * 2) one for each compound statement,
158 * to record its declarations.
160 * The current meaning of a name can be found by searching the levels from
161 * the current one out to the global one.
164 /* Note that the information in the `names' component of the global contour
165 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
167 struct binding_level GTY(())
169 /* A chain of _DECL nodes for all variables, constants, functions,
170 and typedef types. These are in the reverse of the order supplied.
174 /* A list of structure, union and enum definitions,
175 * for looking up tag names.
176 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
177 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
178 * or ENUMERAL_TYPE node.
182 /* For each level, a list of shadowed outer-level local definitions
183 to be restored when this level is popped.
184 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
185 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
188 /* For each level (except not the global one),
189 a chain of BLOCK nodes for all the levels
190 that were entered and exited one level down. */
193 /* The BLOCK node for this level, if one has been preallocated.
194 If 0, the BLOCK is allocated (if needed) when the level is popped. */
197 /* The binding level which this one is contained in (inherits from). */
198 struct binding_level *level_chain;
200 /* Nonzero for the level that holds the parameters of a function. */
203 /* Nonzero if this level "doesn't exist" for tags. */
204 char tag_transparent;
206 /* Nonzero if sublevels of this level "don't exist" for tags.
207 This is set in the parm level of a function definition
208 while reading the function body, so that the outermost block
209 of the function body will be tag-transparent. */
210 char subblocks_tag_transparent;
212 /* Nonzero means make a BLOCK for this level regardless of all else. */
215 /* Nonzero means make a BLOCK if this level has any subblocks. */
216 char keep_if_subblocks;
218 /* List of decls in `names' that have incomplete structure or
220 tree incomplete_list;
222 /* A list of decls giving the (reversed) specified order of parms,
223 not including any forward-decls in the parmlist.
224 This is so we can put the parms in proper order for assign_parms. */
228 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
230 /* The binding level currently in effect. */
232 static GTY(()) struct binding_level *current_binding_level;
234 /* A chain of binding_level structures awaiting reuse. */
236 static GTY((deletable (""))) struct binding_level *free_binding_level;
238 /* The outermost binding level, for names of file scope.
239 This is created when the compiler is started and exists
240 through the entire run. */
242 static GTY(()) struct binding_level *global_binding_level;
244 /* Binding level structures are initialized by copying this one. */
246 static struct binding_level clear_binding_level
247 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, NULL,
250 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
252 static int keep_next_level_flag;
254 /* Nonzero means make a BLOCK for the next level pushed
255 if it has subblocks. */
257 static int keep_next_if_subblocks;
259 /* The chain of outer levels of label scopes.
260 This uses the same data structure used for binding levels,
261 but it works differently: each link in the chain records
262 saved values of named_labels and shadowed_labels for
263 a label binding level outside the current one. */
265 static GTY(()) struct binding_level *label_level_chain;
267 /* Functions called automatically at the beginning and end of execution. */
269 tree static_ctors, static_dtors;
271 /* Forward declarations. */
273 static struct binding_level * make_binding_level PARAMS ((void));
274 static void pop_binding_level PARAMS ((struct binding_level **));
275 static void clear_limbo_values PARAMS ((tree));
276 static int duplicate_decls PARAMS ((tree, tree, int));
277 static int redeclaration_error_message PARAMS ((tree, tree));
278 static void storedecls PARAMS ((tree));
279 static void storetags PARAMS ((tree));
280 static tree lookup_tag PARAMS ((enum tree_code, tree,
281 struct binding_level *, int));
282 static tree lookup_tag_reverse PARAMS ((tree));
283 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
285 static tree grokparms PARAMS ((tree, int));
286 static void layout_array_type PARAMS ((tree));
287 static tree c_make_fname_decl PARAMS ((tree, int));
288 static void c_expand_body PARAMS ((tree, int, int));
289 static void warn_if_shadowing PARAMS ((tree, tree));
291 /* C-specific option variables. */
293 /* Nonzero means allow type mismatches in conditional expressions;
294 just make their values `void'. */
296 int flag_cond_mismatch;
298 /* Nonzero means don't recognize the keyword `asm'. */
302 /* Nonzero means enable C89 Amendment 1 features. */
306 /* Nonzero means use the ISO C99 dialect of C. */
310 /* Nonzero means that we have builtin functions, and main is an int */
314 /* Nonzero means add default format_arg attributes for functions not
317 int flag_noniso_default_format_attributes = 1;
319 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
321 int flag_signed_bitfields = 1;
322 int explicit_flag_signed_bitfields = 0;
324 /* Nonzero means warn about use of implicit int. */
326 int warn_implicit_int;
328 /* Nonzero means warn about usage of long long when `-pedantic'. */
330 int warn_long_long = 1;
332 /* Nonzero means message about use of implicit function declarations;
333 1 means warning; 2 means error. */
335 int mesg_implicit_function_declaration = -1;
337 /* Nonzero means give string constants the type `const char *'
338 to get extra warnings from them. These warnings will be too numerous
339 to be useful, except in thoroughly ANSIfied programs. */
341 int flag_const_strings;
343 /* Nonzero means warn about pointer casts that can drop a type qualifier
344 from the pointer target type. */
348 /* Nonzero means warn when casting a function call to a type that does
349 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
350 when there is no previous declaration of sqrt or malloc. */
352 int warn_bad_function_cast;
354 /* Warn about functions which might be candidates for format attributes. */
356 int warn_missing_format_attribute;
358 /* Warn about traditional constructs whose meanings changed in ANSI C. */
360 int warn_traditional;
362 /* Nonzero means warn about sizeof(function) or addition/subtraction
363 of function pointers. */
365 int warn_pointer_arith;
367 /* Nonzero means warn for non-prototype function decls
368 or non-prototyped defs without previous prototype. */
370 int warn_strict_prototypes;
372 /* Nonzero means warn for any global function def
373 without separate previous prototype decl. */
375 int warn_missing_prototypes;
377 /* Nonzero means warn for any global function def
378 without separate previous decl. */
380 int warn_missing_declarations;
382 /* Nonzero means warn about multiple (redundant) decls for the same single
383 variable or function. */
385 int warn_redundant_decls = 0;
387 /* Nonzero means warn about extern declarations of objects not at
388 file-scope level and about *all* declarations of functions (whether
389 extern or static) not at file-scope level. Note that we exclude
390 implicit function declarations. To get warnings about those, use
393 int warn_nested_externs = 0;
395 /* Warn about a subscript that has type char. */
397 int warn_char_subscripts = 0;
399 /* Warn if a type conversion is done that might have confusing results. */
403 /* Warn if adding () is suggested. */
405 int warn_parentheses;
407 /* Warn if initializer is not completely bracketed. */
409 int warn_missing_braces;
411 /* Warn if main is suspicious. */
415 /* Warn about #pragma directives that are not recognised. */
417 int warn_unknown_pragmas = 0; /* Tri state variable. */
419 /* Warn about comparison of signed and unsigned values.
420 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
422 int warn_sign_compare = -1;
424 /* Warn about testing equality of floating point numbers. */
426 int warn_float_equal = 0;
428 /* Nonzero means `$' can be in an identifier. */
430 #ifndef DOLLARS_IN_IDENTIFIERS
431 #define DOLLARS_IN_IDENTIFIERS 1
433 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
435 /* States indicating how grokdeclarator() should handle declspecs marked
436 with __attribute__((deprecated)). An object declared as
437 __attribute__((deprecated)) suppresses warnings of uses of other
440 enum deprecated_states {
445 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
447 /* Decode the string P as a language-specific option for C.
448 Return the number of strings consumed. Should not complain
449 if it does not recognise the option. */
452 c_decode_option (argc, argv)
453 int argc ATTRIBUTE_UNUSED;
456 int strings_processed;
459 static const struct {
460 /* The name of the option. */
462 /* If non-NULL, a flag variable to set to 0 or 1. If NULL,
463 this means that cpp handles this option. */
466 /* This list is in alphabetical order. Keep it like that. */
467 { "bad-function-cast", &warn_bad_function_cast },
468 { "cast-qual", &warn_cast_qual },
469 { "char-subscripts", &warn_char_subscripts },
471 { "comments", NULL },
472 { "conversion", &warn_conversion },
473 { "div-by-zero", &warn_div_by_zero },
474 { "float-equal", &warn_float_equal },
475 { "format-extra-args", &warn_format_extra_args },
476 { "format-zero-length", &warn_format_zero_length },
477 { "format-nonliteral", &warn_format_nonliteral },
478 { "format-security", &warn_format_security },
479 { "format-y2k", &warn_format_y2k },
480 { "implicit-function-declaration", &mesg_implicit_function_declaration },
481 { "implicit-int", &warn_implicit_int },
483 { "long-long", &warn_long_long },
484 { "main", &warn_main },
485 { "missing-braces", &warn_missing_braces },
486 { "missing-declarations", &warn_missing_declarations },
487 { "missing-format-attribute", &warn_missing_format_attribute },
488 { "missing-prototypes", &warn_missing_prototypes },
489 { "multichar", &warn_multichar },
490 { "nested-externs", &warn_nested_externs },
491 { "nonnull", &warn_nonnull },
492 { "parentheses", &warn_parentheses },
493 { "pointer-arith", &warn_pointer_arith },
494 { "redundant-decls", &warn_redundant_decls },
495 { "return-type", &warn_return_type },
496 { "sequence-point", &warn_sequence_point },
497 { "sign-compare", &warn_sign_compare },
498 { "strict-prototypes", &warn_strict_prototypes },
499 { "traditional", &warn_traditional },
500 { "trigraphs", NULL },
502 { "write-strings", &flag_const_strings }
505 strings_processed = cpp_handle_option (parse_in, argc, argv, 0);
507 if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
512 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
516 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
520 else if (!strncmp (p, "-std=", 5))
522 /* Select the appropriate language standard. We currently
524 -std=iso9899:1990 same as -ansi
525 -std=iso9899:199409 ISO C as modified in amend. 1
526 -std=iso9899:1999 ISO C 99
527 -std=c89 same as -std=iso9899:1990
528 -std=c99 same as -std=iso9899:1999
529 -std=gnu89 default, iso9899:1990 + gnu extensions
530 -std=gnu99 iso9899:1999 + gnu extensions
532 const char *const argstart = &p[5];
534 if (!strcmp (argstart, "iso9899:1990")
535 || !strcmp (argstart, "c89"))
540 flag_writable_strings = 0;
542 flag_no_nonansi_builtin = 1;
543 flag_noniso_default_format_attributes = 0;
547 else if (!strcmp (argstart, "iso9899:199409"))
552 else if (!strcmp (argstart, "iso9899:199x")
553 || !strcmp (argstart, "iso9899:1999")
554 || !strcmp (argstart, "c9x")
555 || !strcmp (argstart, "c99"))
557 flag_writable_strings = 0;
559 flag_no_nonansi_builtin = 1;
560 flag_noniso_default_format_attributes = 0;
565 else if (!strcmp (argstart, "gnu89"))
567 flag_writable_strings = 0;
569 flag_no_nonansi_builtin = 0;
570 flag_noniso_default_format_attributes = 1;
574 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
576 flag_writable_strings = 0;
578 flag_no_nonansi_builtin = 0;
579 flag_noniso_default_format_attributes = 1;
583 else if (!strcmp (argstart, "c++98"))
584 ; /* Handled by cpplib. */
586 error ("unknown C standard `%s'", argstart);
588 else if (!strcmp (p, "-fdollars-in-identifiers"))
589 dollars_in_ident = 1;
590 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
591 dollars_in_ident = 0;
592 else if (!strcmp (p, "-fsigned-char"))
593 flag_signed_char = 1;
594 else if (!strcmp (p, "-funsigned-char"))
595 flag_signed_char = 0;
596 else if (!strcmp (p, "-fno-signed-char"))
597 flag_signed_char = 0;
598 else if (!strcmp (p, "-fno-unsigned-char"))
599 flag_signed_char = 1;
600 else if (!strcmp (p, "-fsigned-bitfields")
601 || !strcmp (p, "-fno-unsigned-bitfields"))
603 flag_signed_bitfields = 1;
604 explicit_flag_signed_bitfields = 1;
606 else if (!strcmp (p, "-funsigned-bitfields")
607 || !strcmp (p, "-fno-signed-bitfields"))
609 flag_signed_bitfields = 0;
610 explicit_flag_signed_bitfields = 1;
612 else if (!strcmp (p, "-fshort-enums"))
613 flag_short_enums = 1;
614 else if (!strcmp (p, "-fno-short-enums"))
615 flag_short_enums = 0;
616 else if (!strcmp (p, "-fshort-wchar"))
617 flag_short_wchar = 1;
618 else if (!strcmp (p, "-fno-short-wchar"))
619 flag_short_wchar = 0;
620 else if (!strcmp (p, "-fcond-mismatch"))
621 flag_cond_mismatch = 1;
622 else if (!strcmp (p, "-fno-cond-mismatch"))
623 flag_cond_mismatch = 0;
624 else if (!strcmp (p, "-fshort-double"))
625 flag_short_double = 1;
626 else if (!strcmp (p, "-fno-short-double"))
627 flag_short_double = 0;
628 else if (!strcmp (p, "-fasm"))
630 else if (!strcmp (p, "-fno-asm"))
632 else if (!strcmp (p, "-fbuiltin"))
634 else if (!strcmp (p, "-fno-builtin"))
636 else if (!strncmp (p, "-fno-builtin-", strlen ("-fno-builtin-")))
637 disable_builtin_function (p + strlen ("-fno-builtin-"));
638 else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
640 else if (!strcmp (p, "-ansi"))
642 else if (!strcmp (p, "-undef"))
644 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
645 mesg_implicit_function_declaration = 2;
646 else if (!strncmp (p, "-Wformat=", 9))
647 set_Wformat (atoi (p + 9));
648 else if (!strcmp (p, "-Wformat"))
650 else if (!strcmp (p, "-Wno-format"))
652 else if (!strcmp (p, "-Wimplicit"))
654 warn_implicit_int = 1;
655 if (mesg_implicit_function_declaration != 2)
656 mesg_implicit_function_declaration = 1;
658 else if (!strcmp (p, "-Wno-implicit"))
659 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
660 else if (!strcmp (p, "-Wno-main"))
662 else if (!strcmp (p, "-Wunknown-pragmas"))
663 /* Set to greater than 1, so that even unknown pragmas in system
664 headers will be warned about. */
665 warn_unknown_pragmas = 2;
666 else if (!strcmp (p, "-Wno-unknown-pragmas"))
667 warn_unknown_pragmas = 0;
668 else if (!strcmp (p, "-Wall"))
670 /* We save the value of warn_uninitialized, since if they put
671 -Wuninitialized on the command line, we need to generate a
672 warning about not using it without also specifying -O. */
673 if (warn_uninitialized != 1)
674 warn_uninitialized = 2;
675 warn_implicit_int = 1;
676 mesg_implicit_function_declaration = 1;
677 warn_return_type = 1;
681 warn_char_subscripts = 1;
682 warn_parentheses = 1;
683 warn_sequence_point = 1;
684 warn_missing_braces = 1;
685 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
686 it off only if it's not explicit. */
688 /* Only warn about unknown pragmas that are not in system headers. */
689 warn_unknown_pragmas = 1;
691 else if (!strcmp (p, "-E"))
692 flag_preprocess_only = 1;
696 for (i = 0; i < sizeof (warn_options) / sizeof (warn_options[0]); i++)
697 if (strncmp (p, "-W", 2) == 0
698 && warn_options[i].flag
699 && (strcmp (p+2, warn_options[i].option) == 0
700 || (strncmp (p+2, "no-", 3) == 0
701 && strcmp (p+5, warn_options[i].option) == 0)))
703 *(warn_options[i].flag) = strncmp (p+2, "no-", 3) != 0;
706 return strings_processed;
713 c_print_identifier (file, node, indent)
718 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
719 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
720 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
721 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
722 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
723 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
724 if (C_IS_RESERVED_WORD (node))
726 tree rid = ridpointers[C_RID_CODE (node)];
727 indent_to (file, indent + 4);
728 fprintf (file, "rid ");
729 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
730 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
734 /* Hook called at end of compilation to assume 1 elt
735 for a top-level tentative array defn that wasn't complete before. */
738 c_finish_incomplete_decl (decl)
741 if (TREE_CODE (decl) == VAR_DECL)
743 tree type = TREE_TYPE (decl);
744 if (type != error_mark_node
745 && TREE_CODE (type) == ARRAY_TYPE
746 && ! DECL_EXTERNAL (decl)
747 && TYPE_DOMAIN (type) == 0)
749 warning_with_decl (decl, "array `%s' assumed to have one element");
751 complete_array_type (type, NULL_TREE, 1);
753 layout_decl (decl, 0);
758 /* Reuse or create a struct for this binding level. */
760 static struct binding_level *
761 make_binding_level ()
763 if (free_binding_level)
765 struct binding_level *result = free_binding_level;
766 free_binding_level = result->level_chain;
770 return (struct binding_level *) ggc_alloc (sizeof (struct binding_level));
773 /* Remove a binding level from a list and add it to the level chain. */
776 pop_binding_level (lp)
777 struct binding_level **lp;
779 struct binding_level *l = *lp;
780 *lp = l->level_chain;
782 memset (l, 0, sizeof (struct binding_level));
783 l->level_chain = free_binding_level;
784 free_binding_level = l;
787 /* Nonzero if we are currently in the global binding level. */
792 return current_binding_level == global_binding_level;
798 keep_next_level_flag = 1;
801 /* Nonzero if the current level needs to have a BLOCK made. */
806 return ((current_binding_level->keep_if_subblocks
807 && current_binding_level->blocks != 0)
808 || current_binding_level->keep
809 || current_binding_level->names != 0
810 || (current_binding_level->tags != 0
811 && !current_binding_level->tag_transparent));
814 /* Identify this binding level as a level of parameters.
815 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
816 But it turns out there is no way to pass the right value for
817 DEFINITION_FLAG, so we ignore it. */
820 declare_parm_level (definition_flag)
821 int definition_flag ATTRIBUTE_UNUSED;
823 current_binding_level->parm_flag = 1;
826 /* Nonzero if currently making parm declarations. */
831 return current_binding_level->parm_flag;
834 /* Enter a new binding level.
835 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
836 not for that of tags. */
839 pushlevel (tag_transparent)
842 struct binding_level *newlevel = NULL_BINDING_LEVEL;
844 /* If this is the top level of a function,
845 just make sure that NAMED_LABELS is 0. */
847 if (current_binding_level == global_binding_level)
852 newlevel = make_binding_level ();
854 /* Add this level to the front of the chain (stack) of levels that
857 *newlevel = clear_binding_level;
858 newlevel->tag_transparent
860 || (current_binding_level
861 ? current_binding_level->subblocks_tag_transparent
863 newlevel->level_chain = current_binding_level;
864 current_binding_level = newlevel;
865 newlevel->keep = keep_next_level_flag;
866 keep_next_level_flag = 0;
867 newlevel->keep_if_subblocks = keep_next_if_subblocks;
868 keep_next_if_subblocks = 0;
871 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
874 clear_limbo_values (block)
879 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
880 if (DECL_NAME (tem) != 0)
881 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
883 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
884 clear_limbo_values (tem);
887 /* Exit a binding level.
888 Pop the level off, and restore the state of the identifier-decl mappings
889 that were in effect when this level was entered.
891 If KEEP is nonzero, this level had explicit declarations, so
892 and create a "block" (a BLOCK node) for the level
893 to record its declarations and subblocks for symbol table output.
895 If FUNCTIONBODY is nonzero, this level is the body of a function,
896 so create a block as if KEEP were set and also clear out all
899 If REVERSE is nonzero, reverse the order of decls before putting
900 them into the BLOCK. */
903 poplevel (keep, reverse, functionbody)
909 /* The chain of decls was accumulated in reverse order.
910 Put it into forward order, just for cleanliness. */
912 tree tags = current_binding_level->tags;
913 tree subblocks = current_binding_level->blocks;
916 int block_previously_created;
918 keep |= current_binding_level->keep;
920 /* This warning is turned off because it causes warnings for
921 declarations like `extern struct foo *x'. */
923 /* Warn about incomplete structure types in this level. */
924 for (link = tags; link; link = TREE_CHAIN (link))
925 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
927 tree type = TREE_VALUE (link);
928 tree type_name = TYPE_NAME (type);
929 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
931 : DECL_NAME (type_name));
932 switch (TREE_CODE (type))
935 error ("`struct %s' incomplete in scope ending here", id);
938 error ("`union %s' incomplete in scope ending here", id);
941 error ("`enum %s' incomplete in scope ending here", id);
947 /* Get the decls in the order they were written.
948 Usually current_binding_level->names is in reverse order.
949 But parameter decls were previously put in forward order. */
952 current_binding_level->names
953 = decls = nreverse (current_binding_level->names);
955 decls = current_binding_level->names;
957 /* Output any nested inline functions within this block
958 if they weren't already output. */
960 for (decl = decls; decl; decl = TREE_CHAIN (decl))
961 if (TREE_CODE (decl) == FUNCTION_DECL
962 && ! TREE_ASM_WRITTEN (decl)
963 && DECL_INITIAL (decl) != 0
964 && TREE_ADDRESSABLE (decl))
966 /* If this decl was copied from a file-scope decl
967 on account of a block-scope extern decl,
968 propagate TREE_ADDRESSABLE to the file-scope decl.
970 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
971 true, since then the decl goes through save_for_inline_copying. */
972 if (DECL_ABSTRACT_ORIGIN (decl) != 0
973 && DECL_ABSTRACT_ORIGIN (decl) != decl)
974 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
977 /* We used to warn about unused variables in expand_end_bindings,
978 i.e. while generating RTL. But in function-at-a-time mode we may
979 choose to never expand a function at all (e.g. auto inlining), so
980 we do this explicitly now. */
981 warn_about_unused_variables (getdecls ());
983 /* If there were any declarations or structure tags in that level,
984 or if this level is a function body,
985 create a BLOCK to record them for the life of this function. */
988 block_previously_created = (current_binding_level->this_block != 0);
989 if (block_previously_created)
990 block = current_binding_level->this_block;
991 else if (keep || functionbody
992 || (current_binding_level->keep_if_subblocks && subblocks != 0))
993 block = make_node (BLOCK);
996 BLOCK_VARS (block) = decls;
997 BLOCK_SUBBLOCKS (block) = subblocks;
1000 /* In each subblock, record that this is its superior. */
1002 for (link = subblocks; link; link = TREE_CHAIN (link))
1003 BLOCK_SUPERCONTEXT (link) = block;
1005 /* Clear out the meanings of the local variables of this level. */
1007 for (link = decls; link; link = TREE_CHAIN (link))
1009 if (DECL_NAME (link) != 0)
1011 /* If the ident. was used or addressed via a local extern decl,
1012 don't forget that fact. */
1013 if (DECL_EXTERNAL (link))
1015 if (TREE_USED (link))
1016 TREE_USED (DECL_NAME (link)) = 1;
1017 if (TREE_ADDRESSABLE (link))
1018 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1020 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1024 /* Restore all name-meanings of the outer levels
1025 that were shadowed by this level. */
1027 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1028 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1030 /* If the level being exited is the top level of a function,
1031 check over all the labels, and clear out the current
1032 (function local) meanings of their names. */
1036 clear_limbo_values (block);
1038 /* If this is the top level block of a function,
1039 the vars are the function's parameters.
1040 Don't leave them in the BLOCK because they are
1041 found in the FUNCTION_DECL instead. */
1043 BLOCK_VARS (block) = 0;
1045 /* Clear out the definitions of all label names,
1046 since their scopes end here,
1047 and add them to BLOCK_VARS. */
1049 for (link = named_labels; link; link = TREE_CHAIN (link))
1051 tree label = TREE_VALUE (link);
1053 if (DECL_INITIAL (label) == 0)
1055 error_with_decl (label, "label `%s' used but not defined");
1056 /* Avoid crashing later. */
1057 define_label (input_filename, lineno,
1060 else if (warn_unused_label && !TREE_USED (label))
1061 warning_with_decl (label, "label `%s' defined but not used");
1062 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1064 /* Put the labels into the "variables" of the
1065 top-level block, so debugger can see them. */
1066 TREE_CHAIN (label) = BLOCK_VARS (block);
1067 BLOCK_VARS (block) = label;
1071 /* Pop the current level, and free the structure for reuse. */
1073 pop_binding_level (¤t_binding_level);
1075 /* Dispose of the block that we just made inside some higher level. */
1077 DECL_INITIAL (current_function_decl) = block;
1080 if (!block_previously_created)
1081 current_binding_level->blocks
1082 = chainon (current_binding_level->blocks, block);
1084 /* If we did not make a block for the level just exited,
1085 any blocks made for inner levels
1086 (since they cannot be recorded as subblocks in that level)
1087 must be carried forward so they will later become subblocks
1088 of something else. */
1090 current_binding_level->blocks
1091 = chainon (current_binding_level->blocks, subblocks);
1093 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1094 binding contour so that they point to the appropriate construct, i.e.
1095 either to the current FUNCTION_DECL node, or else to the BLOCK node
1096 we just constructed.
1098 Note that for tagged types whose scope is just the formal parameter
1099 list for some function type specification, we can't properly set
1100 their TYPE_CONTEXTs here, because we don't have a pointer to the
1101 appropriate FUNCTION_TYPE node readily available to us. For those
1102 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1103 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1104 node which will represent the "scope" for these "parameter list local"
1108 for (link = tags; link; link = TREE_CHAIN (link))
1109 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1111 for (link = tags; link; link = TREE_CHAIN (link))
1112 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1115 TREE_USED (block) = 1;
1120 /* Insert BLOCK at the end of the list of subblocks of the
1121 current binding level. This is used when a BIND_EXPR is expanded,
1122 to handle the BLOCK node inside the BIND_EXPR. */
1125 insert_block (block)
1128 TREE_USED (block) = 1;
1129 current_binding_level->blocks
1130 = chainon (current_binding_level->blocks, block);
1133 /* Set the BLOCK node for the innermost scope
1134 (the one we are currently in). */
1140 current_binding_level->this_block = block;
1141 current_binding_level->names = chainon (current_binding_level->names,
1142 BLOCK_VARS (block));
1143 current_binding_level->blocks = chainon (current_binding_level->blocks,
1144 BLOCK_SUBBLOCKS (block));
1150 struct binding_level *newlevel;
1152 newlevel = make_binding_level ();
1154 /* Add this level to the front of the chain (stack) of label levels. */
1156 newlevel->level_chain = label_level_chain;
1157 label_level_chain = newlevel;
1159 newlevel->names = named_labels;
1160 newlevel->shadowed = shadowed_labels;
1162 shadowed_labels = 0;
1168 struct binding_level *level = label_level_chain;
1171 /* Clear out the definitions of the declared labels in this level.
1172 Leave in the list any ordinary, non-declared labels. */
1173 for (link = named_labels, prev = 0; link;)
1175 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1177 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1179 error_with_decl (TREE_VALUE (link),
1180 "label `%s' used but not defined");
1181 /* Avoid crashing later. */
1182 define_label (input_filename, lineno,
1183 DECL_NAME (TREE_VALUE (link)));
1185 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1186 warning_with_decl (TREE_VALUE (link),
1187 "label `%s' defined but not used");
1188 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1190 /* Delete this element from the list. */
1191 link = TREE_CHAIN (link);
1193 TREE_CHAIN (prev) = link;
1195 named_labels = link;
1200 link = TREE_CHAIN (link);
1204 /* Bring back all the labels that were shadowed. */
1205 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1206 if (DECL_NAME (TREE_VALUE (link)) != 0)
1207 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1208 = TREE_VALUE (link);
1210 named_labels = chainon (named_labels, level->names);
1211 shadowed_labels = level->shadowed;
1213 /* Pop the current level, and free the structure for reuse. */
1214 pop_binding_level (&label_level_chain);
1217 /* Push a definition or a declaration of struct, union or enum tag "name".
1218 "type" should be the type node.
1219 We assume that the tag "name" is not already defined.
1221 Note that the definition may really be just a forward reference.
1222 In that case, the TYPE_SIZE will be zero. */
1225 pushtag (name, type)
1228 struct binding_level *b;
1230 /* Find the proper binding level for this type tag. */
1232 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1237 /* Record the identifier as the type's name if it has none. */
1239 if (TYPE_NAME (type) == 0)
1240 TYPE_NAME (type) = name;
1243 b->tags = tree_cons (name, type, b->tags);
1245 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1246 tagged type we just added to the current binding level. This fake
1247 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1248 to output a representation of a tagged type, and it also gives
1249 us a convenient place to record the "scope start" address for the
1252 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1254 /* An approximation for now, so we can tell this is a function-scope tag.
1255 This will be updated in poplevel. */
1256 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1259 /* Handle when a new declaration NEWDECL
1260 has the same name as an old one OLDDECL
1261 in the same binding contour.
1262 Prints an error message if appropriate.
1264 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1265 Otherwise, return 0.
1267 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1268 and OLDDECL is in an outer binding level and should thus not be changed. */
1271 duplicate_decls (newdecl, olddecl, different_binding_level)
1272 tree newdecl, olddecl;
1273 int different_binding_level;
1275 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1276 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1277 && DECL_INITIAL (newdecl) != 0);
1278 tree oldtype = TREE_TYPE (olddecl);
1279 tree newtype = TREE_TYPE (newdecl);
1282 if (DECL_P (olddecl))
1284 if (TREE_CODE (newdecl) == FUNCTION_DECL
1285 && TREE_CODE (olddecl) == FUNCTION_DECL
1286 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1288 if (DECL_DECLARED_INLINE_P (newdecl)
1289 && DECL_UNINLINABLE (newdecl)
1290 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1291 /* Already warned elsewhere. */;
1292 else if (DECL_DECLARED_INLINE_P (olddecl)
1293 && DECL_UNINLINABLE (olddecl)
1294 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1295 /* Already warned. */;
1296 else if (DECL_DECLARED_INLINE_P (newdecl)
1297 && ! DECL_DECLARED_INLINE_P (olddecl)
1298 && DECL_UNINLINABLE (olddecl)
1299 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1301 warning_with_decl (newdecl,
1302 "function `%s' redeclared as inline");
1303 warning_with_decl (olddecl,
1304 "previous declaration of function `%s' with attribute noinline");
1306 else if (DECL_DECLARED_INLINE_P (olddecl)
1307 && DECL_UNINLINABLE (newdecl)
1308 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1310 warning_with_decl (newdecl,
1311 "function `%s' redeclared with attribute noinline");
1312 warning_with_decl (olddecl,
1313 "previous declaration of function `%s' was inline");
1317 DECL_ATTRIBUTES (newdecl)
1318 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1321 if (TREE_CODE (newtype) == ERROR_MARK
1322 || TREE_CODE (oldtype) == ERROR_MARK)
1325 /* New decl is completely inconsistent with the old one =>
1326 tell caller to replace the old one.
1327 This is always an error except in the case of shadowing a builtin. */
1328 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1330 if (TREE_CODE (olddecl) == FUNCTION_DECL
1331 && (DECL_BUILT_IN (olddecl)
1332 || DECL_BUILT_IN_NONANSI (olddecl)))
1334 /* If you declare a built-in or predefined function name as static,
1335 the old definition is overridden,
1336 but optionally warn this was a bad choice of name. */
1337 if (!TREE_PUBLIC (newdecl))
1341 else if (DECL_BUILT_IN (olddecl))
1342 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1344 warning_with_decl (newdecl, "shadowing library function `%s'");
1346 /* Likewise, if the built-in is not ansi, then programs can
1347 override it even globally without an error. */
1348 else if (! DECL_BUILT_IN (olddecl))
1349 warning_with_decl (newdecl,
1350 "library function `%s' declared as non-function");
1352 else if (DECL_BUILT_IN_NONANSI (olddecl))
1353 warning_with_decl (newdecl,
1354 "built-in function `%s' declared as non-function");
1356 warning_with_decl (newdecl,
1357 "built-in function `%s' declared as non-function");
1361 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1362 error_with_decl (olddecl, "previous declaration of `%s'");
1368 /* For real parm decl following a forward decl,
1369 return 1 so old decl will be reused. */
1370 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1371 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1374 /* The new declaration is the same kind of object as the old one.
1375 The declarations may partially match. Print warnings if they don't
1376 match enough. Ultimately, copy most of the information from the new
1377 decl to the old one, and keep using the old one. */
1379 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
1381 /* A function declaration for a built-in function. */
1382 if (!TREE_PUBLIC (newdecl))
1384 /* If you declare a built-in function name as static, the
1385 built-in definition is overridden,
1386 but optionally warn this was a bad choice of name. */
1388 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1389 /* Discard the old built-in function. */
1392 else if (!types_match)
1394 /* Accept the return type of the new declaration if same modes. */
1395 tree oldreturntype = TREE_TYPE (oldtype);
1396 tree newreturntype = TREE_TYPE (newtype);
1398 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1400 /* Function types may be shared, so we can't just modify
1401 the return type of olddecl's function type. */
1403 = build_function_type (newreturntype,
1404 TYPE_ARG_TYPES (oldtype));
1405 trytype = build_type_attribute_variant (trytype,
1406 TYPE_ATTRIBUTES (oldtype));
1408 types_match = comptypes (newtype, trytype);
1412 /* Accept harmless mismatch in first argument type also.
1413 This is for the ffs and fprintf builtins. */
1414 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1415 && TYPE_ARG_TYPES (oldtype) != 0
1416 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1417 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1418 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1419 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1421 /* Function types may be shared, so we can't just modify
1422 the return type of olddecl's function type. */
1424 = build_function_type (TREE_TYPE (oldtype),
1425 tree_cons (NULL_TREE,
1426 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1427 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1428 trytype = build_type_attribute_variant (trytype,
1429 TYPE_ATTRIBUTES (oldtype));
1431 types_match = comptypes (newtype, trytype);
1435 if (! different_binding_level)
1436 TREE_TYPE (olddecl) = oldtype;
1438 else if (TYPE_ARG_TYPES (oldtype) == NULL
1439 && TYPE_ARG_TYPES (newtype) != NULL)
1441 /* For bcmp, bzero, fputs the builtin type has arguments not
1442 specified. Use the ones from the prototype so that type checking
1443 is done for them. */
1445 = build_function_type (TREE_TYPE (oldtype),
1446 TYPE_ARG_TYPES (newtype));
1447 trytype = build_type_attribute_variant (trytype,
1448 TYPE_ATTRIBUTES (oldtype));
1451 if (! different_binding_level)
1452 TREE_TYPE (olddecl) = oldtype;
1456 /* If types don't match for a built-in, throw away the built-in. */
1457 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1461 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1462 && DECL_SOURCE_LINE (olddecl) == 0)
1464 /* A function declaration for a predeclared function
1465 that isn't actually built in. */
1466 if (!TREE_PUBLIC (newdecl))
1468 /* If you declare it as static, the
1469 default definition is overridden. */
1472 else if (!types_match)
1474 /* If the types don't match, preserve volatility indication.
1475 Later on, we will discard everything else about the
1476 default declaration. */
1477 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1480 /* Permit char *foo () to match void *foo (...) if not pedantic,
1481 if one of them came from a system header file. */
1482 else if (!types_match
1483 && TREE_CODE (olddecl) == FUNCTION_DECL
1484 && TREE_CODE (newdecl) == FUNCTION_DECL
1485 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1486 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1487 && (DECL_IN_SYSTEM_HEADER (olddecl)
1488 || DECL_IN_SYSTEM_HEADER (newdecl))
1489 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1490 && TYPE_ARG_TYPES (oldtype) == 0
1491 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1492 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1494 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1495 && TYPE_ARG_TYPES (newtype) == 0
1496 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1497 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1500 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1501 /* Make sure we keep void * as ret type, not char *. */
1502 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1503 TREE_TYPE (newdecl) = newtype = oldtype;
1505 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1506 we will come back here again. */
1507 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1509 else if (!types_match
1510 /* Permit char *foo (int, ...); followed by char *foo ();
1512 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1514 /* Return types must still match. */
1515 && comptypes (TREE_TYPE (oldtype),
1516 TREE_TYPE (newtype))
1517 && TYPE_ARG_TYPES (newtype) == 0))
1519 error_with_decl (newdecl, "conflicting types for `%s'");
1520 /* Check for function type mismatch
1521 involving an empty arglist vs a nonempty one. */
1522 if (TREE_CODE (olddecl) == FUNCTION_DECL
1523 && comptypes (TREE_TYPE (oldtype),
1524 TREE_TYPE (newtype))
1525 && ((TYPE_ARG_TYPES (oldtype) == 0
1526 && DECL_INITIAL (olddecl) == 0)
1528 (TYPE_ARG_TYPES (newtype) == 0
1529 && DECL_INITIAL (newdecl) == 0)))
1531 /* Classify the problem further. */
1532 tree t = TYPE_ARG_TYPES (oldtype);
1534 t = TYPE_ARG_TYPES (newtype);
1535 for (; t; t = TREE_CHAIN (t))
1537 tree type = TREE_VALUE (t);
1539 if (TREE_CHAIN (t) == 0
1540 && TYPE_MAIN_VARIANT (type) != void_type_node)
1542 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1546 if (c_type_promotes_to (type) != type)
1548 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1553 error_with_decl (olddecl, "previous declaration of `%s'");
1557 errmsg = redeclaration_error_message (newdecl, olddecl);
1563 error_with_decl (newdecl, "redefinition of `%s'");
1566 error_with_decl (newdecl, "redeclaration of `%s'");
1569 error_with_decl (newdecl, "conflicting declarations of `%s'");
1575 error_with_decl (olddecl,
1576 ((DECL_INITIAL (olddecl)
1577 && current_binding_level == global_binding_level)
1578 ? "`%s' previously defined here"
1579 : "`%s' previously declared here"));
1582 else if (TREE_CODE (newdecl) == TYPE_DECL
1583 && (DECL_IN_SYSTEM_HEADER (olddecl)
1584 || DECL_IN_SYSTEM_HEADER (newdecl)))
1586 warning_with_decl (newdecl, "redefinition of `%s'");
1589 ((DECL_INITIAL (olddecl)
1590 && current_binding_level == global_binding_level)
1591 ? "`%s' previously defined here"
1592 : "`%s' previously declared here"));
1594 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1595 && DECL_INITIAL (olddecl) != 0
1596 && TYPE_ARG_TYPES (oldtype) == 0
1597 && TYPE_ARG_TYPES (newtype) != 0
1598 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1602 /* Prototype decl follows defn w/o prototype. */
1604 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1605 type = TYPE_ARG_TYPES (newtype),
1608 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1610 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1611 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1613 warning_with_decl (newdecl, "prototype for `%s' follows");
1614 warning_with_decl (olddecl, "non-prototype definition here");
1617 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1618 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1620 error_with_decl (newdecl,
1621 "prototype for `%s' follows and number of arguments doesn't match");
1622 error_with_decl (olddecl, "non-prototype definition here");
1626 /* Type for passing arg must be consistent
1627 with that declared for the arg. */
1628 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)))
1630 error_with_decl (newdecl,
1631 "prototype for `%s' follows and argument %d doesn't match",
1633 error_with_decl (olddecl, "non-prototype definition here");
1639 /* Warn about mismatches in various flags. */
1642 /* Warn if function is now inline
1643 but was previously declared not inline and has been called. */
1644 if (TREE_CODE (olddecl) == FUNCTION_DECL
1645 && ! DECL_DECLARED_INLINE_P (olddecl)
1646 && DECL_DECLARED_INLINE_P (newdecl)
1647 && TREE_USED (olddecl))
1648 warning_with_decl (newdecl,
1649 "`%s' declared inline after being called");
1650 if (TREE_CODE (olddecl) == FUNCTION_DECL
1651 && ! DECL_DECLARED_INLINE_P (olddecl)
1652 && DECL_DECLARED_INLINE_P (newdecl)
1653 && DECL_INITIAL (olddecl) != 0)
1654 warning_with_decl (newdecl,
1655 "`%s' declared inline after its definition");
1657 /* If pedantic, warn when static declaration follows a non-static
1658 declaration. Otherwise, do so only for functions. */
1659 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1660 && TREE_PUBLIC (olddecl)
1661 && !TREE_PUBLIC (newdecl))
1662 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1664 /* If warn_traditional, warn when a non-static function
1665 declaration follows a static one. */
1666 if (warn_traditional && !in_system_header
1667 && TREE_CODE (olddecl) == FUNCTION_DECL
1668 && !TREE_PUBLIC (olddecl)
1669 && TREE_PUBLIC (newdecl))
1670 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1672 /* Warn when const declaration follows a non-const
1673 declaration, but not for functions. */
1674 if (TREE_CODE (olddecl) != FUNCTION_DECL
1675 && !TREE_READONLY (olddecl)
1676 && TREE_READONLY (newdecl))
1677 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1678 /* These bits are logically part of the type, for variables.
1679 But not for functions
1680 (where qualifiers are not valid ANSI anyway). */
1681 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1682 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1683 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1684 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1688 /* Optionally warn about more than one declaration for the same name. */
1689 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1690 /* Don't warn about a function declaration
1691 followed by a definition. */
1692 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1693 && DECL_INITIAL (olddecl) == 0)
1694 /* Don't warn about extern decl followed by (tentative) definition. */
1695 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1697 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1698 warning_with_decl (olddecl, "previous declaration of `%s'");
1701 /* Copy all the DECL_... slots specified in the new decl
1702 except for any that we copy here from the old type.
1704 Past this point, we don't change OLDTYPE and NEWTYPE
1705 even if we change the types of NEWDECL and OLDDECL. */
1709 /* When copying info to olddecl, we store into write_olddecl
1710 instead. This allows us to avoid modifying olddecl when
1711 different_binding_level is true. */
1712 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1714 /* Merge the data types specified in the two decls. */
1715 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1717 if (different_binding_level)
1719 if (TYPE_ARG_TYPES (oldtype) != 0
1720 && TYPE_ARG_TYPES (newtype) == 0)
1721 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1724 = build_type_attribute_variant
1726 merge_attributes (TYPE_ATTRIBUTES (newtype),
1727 TYPE_ATTRIBUTES (oldtype)));
1731 = TREE_TYPE (olddecl)
1732 = common_type (newtype, oldtype);
1735 /* Lay the type out, unless already done. */
1736 if (oldtype != TREE_TYPE (newdecl))
1738 if (TREE_TYPE (newdecl) != error_mark_node)
1739 layout_type (TREE_TYPE (newdecl));
1740 if (TREE_CODE (newdecl) != FUNCTION_DECL
1741 && TREE_CODE (newdecl) != TYPE_DECL
1742 && TREE_CODE (newdecl) != CONST_DECL)
1743 layout_decl (newdecl, 0);
1747 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1748 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1749 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1750 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1751 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1752 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1754 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1755 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1759 /* Keep the old rtl since we can safely use it. */
1760 COPY_DECL_RTL (olddecl, newdecl);
1762 /* Merge the type qualifiers. */
1763 if (TREE_CODE (olddecl) == FUNCTION_DECL
1764 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1765 && ! TREE_THIS_VOLATILE (newdecl))
1766 TREE_THIS_VOLATILE (write_olddecl) = 0;
1768 if (TREE_READONLY (newdecl))
1769 TREE_READONLY (write_olddecl) = 1;
1771 if (TREE_THIS_VOLATILE (newdecl))
1773 TREE_THIS_VOLATILE (write_olddecl) = 1;
1774 if (TREE_CODE (newdecl) == VAR_DECL
1775 /* If an automatic variable is re-declared in the same
1776 function scope, but the old declaration was not
1777 volatile, make_var_volatile() would crash because the
1778 variable would have been assigned to a pseudo, not a
1779 MEM. Since this duplicate declaration is invalid
1780 anyway, we just skip the call. */
1782 make_var_volatile (newdecl);
1785 /* Keep source location of definition rather than declaration. */
1786 /* When called with different_binding_level set, keep the old
1787 information so that meaningful diagnostics can be given. */
1788 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1789 && ! different_binding_level)
1791 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1792 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1795 /* Merge the unused-warning information. */
1796 if (DECL_IN_SYSTEM_HEADER (olddecl))
1797 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1798 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1799 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1801 /* Merge the initialization information. */
1802 /* When called with different_binding_level set, don't copy over
1803 DECL_INITIAL, so that we don't accidentally change function
1804 declarations into function definitions. */
1805 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1806 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1808 /* Merge the section attribute.
1809 We want to issue an error if the sections conflict but that must be
1810 done later in decl_attributes since we are called before attributes
1812 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1813 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1815 /* Copy the assembler name.
1816 Currently, it can only be defined in the prototype. */
1817 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1819 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1821 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1822 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1823 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1824 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1825 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1828 /* If cannot merge, then use the new type and qualifiers,
1829 and don't preserve the old rtl. */
1830 else if (! different_binding_level)
1832 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1833 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1834 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1835 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1838 /* Merge the storage class information. */
1839 merge_weak (newdecl, olddecl);
1841 /* For functions, static overrides non-static. */
1842 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1844 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1845 /* This is since we don't automatically
1846 copy the attributes of NEWDECL into OLDDECL. */
1847 /* No need to worry about different_binding_level here because
1848 then TREE_PUBLIC (newdecl) was true. */
1849 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1850 /* If this clears `static', clear it in the identifier too. */
1851 if (! TREE_PUBLIC (olddecl))
1852 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1854 if (DECL_EXTERNAL (newdecl))
1856 if (! different_binding_level)
1858 /* Don't mess with these flags on local externs; they remain
1859 external even if there's a declaration at file scope which
1861 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1862 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1864 /* An extern decl does not override previous storage class. */
1865 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1866 if (! DECL_EXTERNAL (newdecl))
1867 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1871 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1872 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1875 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1877 /* If we're redefining a function previously defined as extern
1878 inline, make sure we emit debug info for the inline before we
1879 throw it away, in case it was inlined into a function that hasn't
1880 been written out yet. */
1881 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1883 (*debug_hooks->outlining_inline_function) (olddecl);
1885 /* The new defn must not be inline. */
1886 DECL_INLINE (newdecl) = 0;
1887 DECL_UNINLINABLE (newdecl) = 1;
1891 /* If either decl says `inline', this fn is inline,
1892 unless its definition was passed already. */
1893 if (DECL_DECLARED_INLINE_P (newdecl)
1894 || DECL_DECLARED_INLINE_P (olddecl))
1895 DECL_DECLARED_INLINE_P (newdecl) = 1;
1897 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1898 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1901 if (DECL_BUILT_IN (olddecl))
1903 /* Get rid of any built-in function if new arg types don't match it
1904 or if we have a function definition. */
1905 if (! types_match || new_is_definition)
1907 if (! different_binding_level)
1909 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1910 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1915 /* If redeclaring a builtin function, and not a definition,
1916 it stays built in. */
1917 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1918 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1922 /* Also preserve various other info from the definition. */
1923 if (! new_is_definition)
1925 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1926 /* When called with different_binding_level set, don't copy over
1927 DECL_INITIAL, so that we don't accidentally change function
1928 declarations into function definitions. */
1929 if (! different_binding_level)
1930 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1931 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1932 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1933 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
1934 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1936 /* Set DECL_INLINE on the declaration if we've got a body
1937 from which to instantiate. */
1938 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1940 DECL_INLINE (newdecl) = 1;
1941 DECL_ABSTRACT_ORIGIN (newdecl)
1942 = (different_binding_level
1943 ? DECL_ORIGIN (olddecl)
1944 : DECL_ABSTRACT_ORIGIN (olddecl));
1949 /* If a previous declaration said inline, mark the
1950 definition as inlinable. */
1951 if (DECL_DECLARED_INLINE_P (newdecl)
1952 && ! DECL_UNINLINABLE (newdecl))
1953 DECL_INLINE (newdecl) = 1;
1956 if (different_binding_level)
1959 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1960 But preserve OLDDECL's DECL_UID. */
1962 unsigned olddecl_uid = DECL_UID (olddecl);
1964 memcpy ((char *) olddecl + sizeof (struct tree_common),
1965 (char *) newdecl + sizeof (struct tree_common),
1966 sizeof (struct tree_decl) - sizeof (struct tree_common));
1967 DECL_UID (olddecl) = olddecl_uid;
1970 /* NEWDECL contains the merged attribute lists.
1971 Update OLDDECL to be the same. */
1972 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1977 /* Check whether decl-node X shadows an existing declaration.
1978 OLDLOCAL is the old IDENTIFIER_LOCAL_VALUE of the DECL_NAME of X,
1979 which might be a NULL_TREE. */
1981 warn_if_shadowing (x, oldlocal)
1986 if (DECL_EXTERNAL (x))
1989 name = DECL_NAME (x);
1991 /* Warn if shadowing an argument at the top level of the body. */
1993 /* This warning doesn't apply to the parms of a nested fcn. */
1994 && ! current_binding_level->parm_flag
1995 /* Check that this is one level down from the parms. */
1996 && current_binding_level->level_chain->parm_flag
1997 /* Check that the decl being shadowed
1998 comes from the parm level, one level up. */
1999 && chain_member (oldlocal, current_binding_level->level_chain->names))
2001 if (TREE_CODE (oldlocal) == PARM_DECL)
2002 pedwarn ("declaration of `%s' shadows a parameter",
2003 IDENTIFIER_POINTER (name));
2005 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2006 IDENTIFIER_POINTER (name));
2008 /* Maybe warn if shadowing something else. */
2009 else if (warn_shadow
2010 /* No shadow warnings for internally generated vars. */
2011 && DECL_SOURCE_LINE (x) != 0
2012 /* No shadow warnings for vars made for inlining. */
2013 && ! DECL_FROM_INLINE (x))
2015 if (TREE_CODE (x) == PARM_DECL
2016 && current_binding_level->level_chain->parm_flag)
2017 /* Don't warn about the parm names in function declarator
2018 within a function declarator.
2019 It would be nice to avoid warning in any function
2020 declarator in a declaration, as opposed to a definition,
2021 but there is no way to tell it's not a definition. */
2025 if (TREE_CODE (oldlocal) == PARM_DECL)
2026 shadow_warning ("a parameter", name, oldlocal);
2028 shadow_warning ("a previous local", name, oldlocal);
2030 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2031 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2032 shadow_warning ("a global declaration", name,
2033 IDENTIFIER_GLOBAL_VALUE (name));
2037 /* Record a decl-node X as belonging to the current lexical scope.
2038 Check for errors (such as an incompatible declaration for the same
2039 name already seen in the same scope).
2041 Returns either X or an old decl for the same name.
2042 If an old decl is returned, it may have been smashed
2043 to agree with what X says. */
2050 tree name = DECL_NAME (x);
2051 struct binding_level *b = current_binding_level;
2053 /* Functions need the lang_decl data. */
2054 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
2055 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
2056 ggc_alloc_cleared (sizeof (struct lang_decl));
2058 DECL_CONTEXT (x) = current_function_decl;
2059 /* A local extern declaration for a function doesn't constitute nesting.
2060 A local auto declaration does, since it's a forward decl
2061 for a nested function coming later. */
2062 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2063 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2064 DECL_CONTEXT (x) = 0;
2068 int different_binding_level = 0;
2070 if (warn_nested_externs
2071 && DECL_EXTERNAL (x)
2072 && b != global_binding_level
2073 && x != IDENTIFIER_IMPLICIT_DECL (name)
2074 /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
2075 && !DECL_IN_SYSTEM_HEADER (x))
2076 warning ("nested extern declaration of `%s'",
2077 IDENTIFIER_POINTER (name));
2079 t = lookup_name_current_level (name);
2080 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2082 t = IDENTIFIER_GLOBAL_VALUE (name);
2083 /* Type decls at global scope don't conflict with externs declared
2084 inside lexical blocks. */
2085 if (! t || TREE_CODE (t) == TYPE_DECL)
2086 /* If there's no visible global declaration, try for an
2088 t = IDENTIFIER_LIMBO_VALUE (name);
2089 different_binding_level = 1;
2091 if (t != 0 && t == error_mark_node)
2092 /* error_mark_node is 0 for a while during initialization! */
2095 error_with_decl (x, "`%s' used prior to declaration");
2098 /* If this decl is `static' and an implicit decl was seen previously,
2100 if (TREE_PUBLIC (name)
2101 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2102 sets this for all functions. */
2103 && ! TREE_PUBLIC (x)
2104 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2105 /* We used to warn also for explicit extern followed by static,
2106 but sometimes you need to do it that way. */
2107 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2109 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2110 IDENTIFIER_POINTER (name));
2111 pedwarn_with_file_and_line
2112 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2113 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2114 "previous declaration of `%s'",
2115 IDENTIFIER_POINTER (name));
2116 TREE_THIS_VOLATILE (name) = 1;
2119 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2121 if (TREE_CODE (t) == PARM_DECL)
2123 /* Don't allow more than one "real" duplicate
2124 of a forward parm decl. */
2125 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2131 /* If we are processing a typedef statement, generate a whole new
2132 ..._TYPE node (which will be just an variant of the existing
2133 ..._TYPE node with identical properties) and then install the
2134 TYPE_DECL node generated to represent the typedef name as the
2135 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2137 The whole point here is to end up with a situation where each
2138 and every ..._TYPE node the compiler creates will be uniquely
2139 associated with AT MOST one node representing a typedef name.
2140 This way, even though the compiler substitutes corresponding
2141 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2142 early on, later parts of the compiler can always do the reverse
2143 translation and get back the corresponding typedef name. For
2146 typedef struct S MY_TYPE;
2149 Later parts of the compiler might only know that `object' was of
2150 type `struct S' if it were not for code just below. With this
2151 code however, later parts of the compiler see something like:
2153 struct S' == struct S
2154 typedef struct S' MY_TYPE;
2157 And they can then deduce (from the node for type struct S') that
2158 the original object declaration was:
2162 Being able to do this is important for proper support of protoize,
2163 and also for generating precise symbolic debugging information
2164 which takes full account of the programmer's (typedef) vocabulary.
2166 Obviously, we don't want to generate a duplicate ..._TYPE node if
2167 the TYPE_DECL node that we are now processing really represents a
2168 standard built-in type.
2170 Since all standard types are effectively declared at line zero
2171 in the source file, we can easily check to see if we are working
2172 on a standard type by checking the current value of lineno. */
2174 if (TREE_CODE (x) == TYPE_DECL)
2176 if (DECL_SOURCE_LINE (x) == 0)
2178 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2179 TYPE_NAME (TREE_TYPE (x)) = x;
2181 else if (TREE_TYPE (x) != error_mark_node
2182 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2184 tree tt = TREE_TYPE (x);
2185 DECL_ORIGINAL_TYPE (x) = tt;
2186 tt = build_type_copy (tt);
2188 TREE_USED (tt) = TREE_USED (x);
2193 /* Multiple external decls of the same identifier ought to match.
2194 We get warnings about inline functions where they are defined.
2195 Avoid duplicate warnings where they are used. */
2197 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2201 if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2202 /* Decls in limbo are always extern, so no need to check that. */
2203 decl = IDENTIFIER_LIMBO_VALUE (name);
2207 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2208 /* If old decl is built-in, we already warned if we should. */
2209 && !DECL_BUILT_IN (decl))
2211 pedwarn_with_decl (x,
2212 "type mismatch with previous external decl");
2213 pedwarn_with_decl (decl, "previous external decl of `%s'");
2217 /* If a function has had an implicit declaration, and then is defined,
2218 make sure they are compatible. */
2220 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2221 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2222 && TREE_CODE (x) == FUNCTION_DECL
2223 && ! comptypes (TREE_TYPE (x),
2224 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2226 warning_with_decl (x, "type mismatch with previous implicit declaration");
2227 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2228 "previous implicit declaration of `%s'");
2231 /* This name is new in its binding level.
2232 Install the new declaration and return it. */
2233 if (b == global_binding_level)
2235 /* Install a global value. */
2237 /* If the first global decl has external linkage,
2238 warn if we later see static one. */
2239 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2240 TREE_PUBLIC (name) = 1;
2242 IDENTIFIER_GLOBAL_VALUE (name) = x;
2244 /* We no longer care about any previous block level declarations. */
2245 IDENTIFIER_LIMBO_VALUE (name) = 0;
2247 /* Don't forget if the function was used via an implicit decl. */
2248 if (IDENTIFIER_IMPLICIT_DECL (name)
2249 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2250 TREE_USED (x) = 1, TREE_USED (name) = 1;
2252 /* Don't forget if its address was taken in that way. */
2253 if (IDENTIFIER_IMPLICIT_DECL (name)
2254 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2255 TREE_ADDRESSABLE (x) = 1;
2257 /* Warn about mismatches against previous implicit decl. */
2258 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2259 /* If this real decl matches the implicit, don't complain. */
2260 && ! (TREE_CODE (x) == FUNCTION_DECL
2261 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2262 == integer_type_node)))
2263 pedwarn ("`%s' was previously implicitly declared to return `int'",
2264 IDENTIFIER_POINTER (name));
2266 /* If this decl is `static' and an `extern' was seen previously,
2267 that is erroneous. */
2268 if (TREE_PUBLIC (name)
2269 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2271 /* Okay to redeclare an ANSI built-in as static. */
2272 if (t != 0 && DECL_BUILT_IN (t))
2274 /* Okay to declare a non-ANSI built-in as anything. */
2275 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2277 /* Okay to have global type decl after an earlier extern
2278 declaration inside a lexical block. */
2279 else if (TREE_CODE (x) == TYPE_DECL)
2281 else if (IDENTIFIER_IMPLICIT_DECL (name))
2283 if (! TREE_THIS_VOLATILE (name))
2284 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2285 IDENTIFIER_POINTER (name));
2288 pedwarn ("`%s' was declared `extern' and later `static'",
2289 IDENTIFIER_POINTER (name));
2294 /* Here to install a non-global value. */
2295 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2296 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2298 IDENTIFIER_LOCAL_VALUE (name) = x;
2300 /* If this is an extern function declaration, see if we
2301 have a global definition or declaration for the function. */
2304 && TREE_CODE (x) == FUNCTION_DECL
2305 && TREE_CODE (oldglobal) == FUNCTION_DECL
2306 && DECL_EXTERNAL (x)
2307 && ! DECL_DECLARED_INLINE_P (x))
2309 /* We have one. Their types must agree. */
2310 if (! comptypes (TREE_TYPE (x),
2311 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2312 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2315 /* Inner extern decl is inline if global one is.
2316 Copy enough to really inline it. */
2317 if (DECL_DECLARED_INLINE_P (oldglobal))
2319 DECL_DECLARED_INLINE_P (x)
2320 = DECL_DECLARED_INLINE_P (oldglobal);
2321 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2322 DECL_INITIAL (x) = (current_function_decl == oldglobal
2323 ? 0 : DECL_INITIAL (oldglobal));
2324 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2325 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2326 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2327 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2328 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2329 DECL_ABSTRACT_ORIGIN (x)
2330 = DECL_ABSTRACT_ORIGIN (oldglobal);
2332 /* Inner extern decl is built-in if global one is. */
2333 if (DECL_BUILT_IN (oldglobal))
2335 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2336 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2338 /* Keep the arg types from a file-scope fcn defn. */
2339 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2340 && DECL_INITIAL (oldglobal)
2341 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2342 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2347 /* This case is probably sometimes the right thing to do. */
2348 /* If we have a local external declaration,
2349 then any file-scope declaration should not
2350 have been static. */
2351 if (oldlocal == 0 && oldglobal != 0
2352 && !TREE_PUBLIC (oldglobal)
2353 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2354 warning ("`%s' locally external but globally static",
2355 IDENTIFIER_POINTER (name));
2358 /* If we have a local external declaration,
2359 and no file-scope declaration has yet been seen,
2360 then if we later have a file-scope decl it must not be static. */
2362 && DECL_EXTERNAL (x)
2366 TREE_PUBLIC (name) = 1;
2368 /* Save this decl, so that we can do type checking against
2369 other decls after it falls out of scope.
2371 Only save it once. This prevents temporary decls created in
2372 expand_inline_function from being used here, since this
2373 will have been set when the inline function was parsed.
2374 It also helps give slightly better warnings. */
2375 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2376 IDENTIFIER_LIMBO_VALUE (name) = x;
2379 warn_if_shadowing (x, oldlocal);
2381 /* If storing a local value, there may already be one (inherited).
2382 If so, record it for restoration when this binding level ends. */
2384 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2387 /* Keep list of variables in this level with incomplete type.
2388 If the input is erroneous, we can have error_mark in the type
2389 slot (e.g. "f(void a, ...)") - that doesn't count as an
2391 if (TREE_TYPE (x) != error_mark_node
2392 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2394 tree element = TREE_TYPE (x);
2396 while (TREE_CODE (element) == ARRAY_TYPE)
2397 element = TREE_TYPE (element);
2398 if (TREE_CODE (element) == RECORD_TYPE
2399 || TREE_CODE (element) == UNION_TYPE)
2400 b->incomplete_list = tree_cons (NULL_TREE, x, b->incomplete_list);
2404 /* Put decls on list in reverse order.
2405 We will reverse them later if necessary. */
2406 TREE_CHAIN (x) = b->names;
2412 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2415 pushdecl_top_level (x)
2419 struct binding_level *b = current_binding_level;
2421 current_binding_level = global_binding_level;
2423 current_binding_level = b;
2427 /* Generate an implicit declaration for identifier FUNCTIONID
2428 as a function of type int (). Print a warning if appropriate. */
2431 implicitly_declare (functionid)
2435 int traditional_warning = 0;
2436 /* Only one "implicit declaration" warning per identifier. */
2437 int implicit_warning;
2439 /* We used to reuse an old implicit decl here,
2440 but this loses with inline functions because it can clobber
2441 the saved decl chains. */
2443 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2444 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2447 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2449 /* Warn of implicit decl following explicit local extern decl.
2450 This is probably a program designed for traditional C. */
2451 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2452 traditional_warning = 1;
2454 /* Warn once of an implicit declaration. */
2455 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2457 DECL_EXTERNAL (decl) = 1;
2458 TREE_PUBLIC (decl) = 1;
2460 /* Record that we have an implicit decl and this is it. */
2461 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2463 /* ANSI standard says implicit declarations are in the innermost block.
2464 So we record the decl in the standard fashion. */
2467 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2468 maybe_objc_check_decl (decl);
2470 rest_of_decl_compilation (decl, NULL, 0, 0);
2472 if (implicit_warning)
2473 implicit_decl_warning (functionid);
2474 else if (warn_traditional && traditional_warning)
2475 warning ("function `%s' was previously declared within a block",
2476 IDENTIFIER_POINTER (functionid));
2478 /* Write a record describing this implicit function declaration to the
2479 prototypes file (if requested). */
2481 gen_aux_info_record (decl, 0, 1, 0);
2483 /* Possibly apply some default attributes to this implicit declaration. */
2484 decl_attributes (&decl, NULL_TREE, 0);
2490 implicit_decl_warning (id)
2493 const char *name = IDENTIFIER_POINTER (id);
2494 if (mesg_implicit_function_declaration == 2)
2495 error ("implicit declaration of function `%s'", name);
2496 else if (mesg_implicit_function_declaration == 1)
2497 warning ("implicit declaration of function `%s'", name);
2500 /* Return zero if the declaration NEWDECL is valid
2501 when the declaration OLDDECL (assumed to be for the same name)
2502 has already been seen.
2503 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2504 and 3 if it is a conflicting declaration. */
2507 redeclaration_error_message (newdecl, olddecl)
2508 tree newdecl, olddecl;
2510 if (TREE_CODE (newdecl) == TYPE_DECL)
2512 /* Do not complain about type redeclarations where at least one
2513 declaration was in a system header. */
2514 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2518 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2520 /* Declarations of functions can insist on internal linkage
2521 but they can't be inconsistent with internal linkage,
2522 so there can be no error on that account.
2523 However defining the same name twice is no good. */
2524 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2525 /* However, defining once as extern inline and a second
2526 time in another way is ok. */
2527 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2528 && ! (DECL_DECLARED_INLINE_P (newdecl)
2529 && DECL_EXTERNAL (newdecl))))
2533 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2535 /* Objects declared at top level: */
2536 /* If at least one is a reference, it's ok. */
2537 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2539 /* Reject two definitions. */
2540 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2542 /* Now we have two tentative defs, or one tentative and one real def. */
2543 /* Insist that the linkage match. */
2544 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2548 else if (current_binding_level->parm_flag
2549 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2553 /* Newdecl has block scope. If olddecl has block scope also, then
2554 reject two definitions, and reject a definition together with an
2555 external reference. Otherwise, it is OK, because newdecl must
2556 be an extern reference to olddecl. */
2557 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2558 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2564 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2565 Create one if none exists so far for the current function.
2566 This function is called for both label definitions and label references. */
2572 tree decl = IDENTIFIER_LABEL_VALUE (id);
2574 if (current_function_decl == 0)
2576 error ("label %s referenced outside of any function",
2577 IDENTIFIER_POINTER (id));
2581 /* Use a label already defined or ref'd with this name. */
2584 /* But not if it is inherited and wasn't declared to be inheritable. */
2585 if (DECL_CONTEXT (decl) != current_function_decl
2586 && ! C_DECLARED_LABEL_FLAG (decl))
2587 return shadow_label (id);
2591 decl = build_decl (LABEL_DECL, id, void_type_node);
2593 /* A label not explicitly declared must be local to where it's ref'd. */
2594 DECL_CONTEXT (decl) = current_function_decl;
2596 DECL_MODE (decl) = VOIDmode;
2598 /* Say where one reference is to the label,
2599 for the sake of the error if it is not defined. */
2600 DECL_SOURCE_LINE (decl) = lineno;
2601 DECL_SOURCE_FILE (decl) = input_filename;
2603 IDENTIFIER_LABEL_VALUE (id) = decl;
2605 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2610 /* Make a label named NAME in the current function,
2611 shadowing silently any that may be inherited from containing functions
2612 or containing scopes.
2614 Note that valid use, if the label being shadowed
2615 comes from another scope in the same function,
2616 requires calling declare_nonlocal_label right away. */
2622 tree decl = IDENTIFIER_LABEL_VALUE (name);
2628 /* Check to make sure that the label hasn't already been declared
2629 at this label scope */
2630 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2631 if (TREE_VALUE (dup) == decl)
2633 error ("duplicate label declaration `%s'",
2634 IDENTIFIER_POINTER (name));
2635 error_with_decl (TREE_VALUE (dup),
2636 "this is a previous declaration");
2637 /* Just use the previous declaration. */
2638 return lookup_label (name);
2641 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2642 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2645 return lookup_label (name);
2648 /* Define a label, specifying the location in the source file.
2649 Return the LABEL_DECL node for the label, if the definition is valid.
2650 Otherwise return 0. */
2653 define_label (filename, line, name)
2654 const char *filename;
2658 tree decl = lookup_label (name);
2660 /* If label with this name is known from an outer context, shadow it. */
2661 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2663 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2664 IDENTIFIER_LABEL_VALUE (name) = 0;
2665 decl = lookup_label (name);
2668 if (warn_traditional && !in_system_header && lookup_name (name))
2669 warning_with_file_and_line (filename, line,
2670 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2671 IDENTIFIER_POINTER (name));
2673 if (DECL_INITIAL (decl) != 0)
2675 error_with_file_and_line (filename, line, "duplicate label `%s'",
2676 IDENTIFIER_POINTER (name));
2681 /* Mark label as having been defined. */
2682 DECL_INITIAL (decl) = error_mark_node;
2683 /* Say where in the source. */
2684 DECL_SOURCE_FILE (decl) = filename;
2685 DECL_SOURCE_LINE (decl) = line;
2690 /* Return the list of declarations of the current level.
2691 Note that this list is in reverse order unless/until
2692 you nreverse it; and when you do nreverse it, you must
2693 store the result back using `storedecls' or you will lose. */
2698 return current_binding_level->names;
2701 /* Return the list of type-tags (for structs, etc) of the current level. */
2706 return current_binding_level->tags;
2709 /* Store the list of declarations of the current level.
2710 This is done for the parameter declarations of a function being defined,
2711 after they are modified in the light of any missing parameters. */
2717 current_binding_level->names = decls;
2720 /* Similarly, store the list of tags of the current level. */
2726 current_binding_level->tags = tags;
2729 /* Given NAME, an IDENTIFIER_NODE,
2730 return the structure (or union or enum) definition for that name.
2731 Searches binding levels from BINDING_LEVEL up to the global level.
2732 If THISLEVEL_ONLY is nonzero, searches only the specified context
2733 (but skips any tag-transparent contexts to find one that is
2734 meaningful for tags).
2735 CODE says which kind of type the caller wants;
2736 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2737 If the wrong kind of type is found, an error is reported. */
2740 lookup_tag (code, name, binding_level, thislevel_only)
2741 enum tree_code code;
2742 struct binding_level *binding_level;
2746 struct binding_level *level;
2749 for (level = binding_level; level; level = level->level_chain)
2752 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2754 if (TREE_PURPOSE (tail) == name)
2756 if (TREE_CODE (TREE_VALUE (tail)) != code)
2758 /* Definition isn't the kind we were looking for. */
2759 pending_invalid_xref = name;
2760 pending_invalid_xref_file = input_filename;
2761 pending_invalid_xref_line = lineno;
2762 /* If in the same binding level as a declaration as a tag
2763 of a different type, this must not be allowed to
2764 shadow that tag, so give the error immediately.
2765 (For example, "struct foo; union foo;" is invalid.) */
2767 pending_xref_error ();
2769 return TREE_VALUE (tail);
2772 if (! level->tag_transparent)
2782 /* Print an error message now
2783 for a recent invalid struct, union or enum cross reference.
2784 We don't print them immediately because they are not invalid
2785 when used in the `struct foo;' construct for shadowing. */
2788 pending_xref_error ()
2790 if (pending_invalid_xref != 0)
2791 error_with_file_and_line (pending_invalid_xref_file,
2792 pending_invalid_xref_line,
2793 "`%s' defined as wrong kind of tag",
2794 IDENTIFIER_POINTER (pending_invalid_xref));
2795 pending_invalid_xref = 0;
2798 /* Given a type, find the tag that was defined for it and return the tag name.
2799 Otherwise return 0. */
2802 lookup_tag_reverse (type)
2805 struct binding_level *level;
2807 for (level = current_binding_level; level; level = level->level_chain)
2810 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2812 if (TREE_VALUE (tail) == type)
2813 return TREE_PURPOSE (tail);
2819 /* Look up NAME in the current binding level and its superiors
2820 in the namespace of variables, functions and typedefs.
2821 Return a ..._DECL node of some kind representing its definition,
2822 or return 0 if it is undefined. */
2830 if (current_binding_level != global_binding_level
2831 && IDENTIFIER_LOCAL_VALUE (name))
2832 val = IDENTIFIER_LOCAL_VALUE (name);
2834 val = IDENTIFIER_GLOBAL_VALUE (name);
2838 /* Similar to `lookup_name' but look only at current binding level. */
2841 lookup_name_current_level (name)
2846 if (current_binding_level == global_binding_level)
2847 return IDENTIFIER_GLOBAL_VALUE (name);
2849 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2852 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2853 if (DECL_NAME (t) == name)
2859 /* Create the predefined scalar types of C,
2860 and some nodes representing standard constants (0, 1, (void *) 0).
2861 Initialize the global binding level.
2862 Make definitions for built-in primitive functions. */
2865 c_init_decl_processing ()
2868 tree ptr_ftype_void, ptr_ftype_ptr;
2870 /* Adds some ggc roots, and reserved words for c-parse.in. */
2873 current_function_decl = NULL;
2874 named_labels = NULL;
2875 current_binding_level = NULL_BINDING_LEVEL;
2876 free_binding_level = NULL_BINDING_LEVEL;
2878 /* Make the binding_level structure for global names. */
2880 global_binding_level = current_binding_level;
2882 build_common_tree_nodes (flag_signed_char);
2884 c_common_nodes_and_builtins ();
2886 boolean_type_node = integer_type_node;
2887 boolean_true_node = integer_one_node;
2888 boolean_false_node = integer_zero_node;
2890 c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
2891 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2892 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2893 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2894 TYPE_PRECISION (c_bool_type_node) = 1;
2895 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2897 c_bool_false_node = build_int_2 (0, 0);
2898 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2899 c_bool_true_node = build_int_2 (1, 0);
2900 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2902 endlink = void_list_node;
2903 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2905 = build_function_type (ptr_type_node,
2906 tree_cons (NULL_TREE, ptr_type_node, endlink));
2908 pedantic_lvalues = pedantic;
2910 make_fname_decl = c_make_fname_decl;
2911 start_fname_decls ();
2914 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2915 decl, NAME is the initialization string and TYPE_DEP indicates whether
2916 NAME depended on the type of the function. As we don't yet implement
2917 delayed emission of static data, we mark the decl as emitted
2918 so it is not placed in the output. Anything using it must therefore pull
2919 out the STRING_CST initializer directly. This does mean that these names
2920 are string merging candidates, which is wrong for C99's __func__. FIXME. */
2923 c_make_fname_decl (id, type_dep)
2927 const char *name = fname_as_string (type_dep);
2928 tree decl, type, init;
2929 size_t length = strlen (name);
2931 type = build_array_type
2932 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2933 build_index_type (size_int (length)));
2935 decl = build_decl (VAR_DECL, id, type);
2936 /* We don't push the decl, so have to set its context here. */
2937 DECL_CONTEXT (decl) = current_function_decl;
2939 TREE_STATIC (decl) = 1;
2940 TREE_READONLY (decl) = 1;
2941 DECL_ARTIFICIAL (decl) = 1;
2943 init = build_string (length + 1, name);
2944 TREE_TYPE (init) = type;
2945 DECL_INITIAL (decl) = init;
2947 TREE_USED (decl) = 1;
2949 finish_decl (decl, init, NULL_TREE);
2954 /* Return a definition for a builtin function named NAME and whose data type
2955 is TYPE. TYPE should be a function type with argument types.
2956 FUNCTION_CODE tells later passes how to compile calls to this function.
2957 See tree.h for its possible values.
2959 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2960 the name to be called if we can't opencode the function. */
2963 builtin_function (name, type, function_code, class, library_name)
2967 enum built_in_class class;
2968 const char *library_name;
2970 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2971 DECL_EXTERNAL (decl) = 1;
2972 TREE_PUBLIC (decl) = 1;
2974 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2975 make_decl_rtl (decl, NULL);
2977 DECL_BUILT_IN_CLASS (decl) = class;
2978 DECL_FUNCTION_CODE (decl) = function_code;
2980 /* The return builtins leave the current function. */
2981 if (function_code == BUILT_IN_RETURN || function_code == BUILT_IN_EH_RETURN)
2982 TREE_THIS_VOLATILE (decl) = 1;
2984 /* Warn if a function in the namespace for users
2985 is used without an occasion to consider it declared. */
2986 if (name[0] != '_' || name[1] != '_')
2987 C_DECL_ANTICIPATED (decl) = 1;
2989 /* Possibly apply some default attributes to this built-in function. */
2990 decl_attributes (&decl, NULL_TREE, 0);
2995 /* Apply default attributes to a function, if a system function with default
2999 c_insert_default_attributes (decl)
3002 if (!TREE_PUBLIC (decl))
3004 c_common_insert_default_attributes (decl);
3007 /* Called when a declaration is seen that contains no names to declare.
3008 If its type is a reference to a structure, union or enum inherited
3009 from a containing scope, shadow that tag name for the current scope
3010 with a forward reference.
3011 If its type defines a new named structure or union
3012 or defines an enum, it is valid but we need not do anything here.
3013 Otherwise, it is an error. */
3016 shadow_tag (declspecs)
3019 shadow_tag_warned (declspecs, 0);
3023 shadow_tag_warned (declspecs, warned)
3026 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3033 pending_invalid_xref = 0;
3035 /* Remove the attributes from declspecs, since they will confuse the
3037 split_specs_attrs (declspecs, &specs, &attrs);
3039 for (link = specs; link; link = TREE_CHAIN (link))
3041 tree value = TREE_VALUE (link);
3042 enum tree_code code = TREE_CODE (value);
3044 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3045 /* Used to test also that TYPE_SIZE (value) != 0.
3046 That caused warning for `struct foo;' at top level in the file. */
3048 tree name = lookup_tag_reverse (value);
3055 if (warned != 1 && code != ENUMERAL_TYPE)
3056 /* Empty unnamed enum OK */
3058 pedwarn ("unnamed struct/union that defines no instances");
3064 t = lookup_tag (code, name, current_binding_level, 1);
3068 t = make_node (code);
3075 if (!warned && ! in_system_header)
3077 warning ("useless keyword or type name in empty declaration");
3084 error ("two types specified in one empty declaration");
3089 pedwarn ("empty declaration");
3093 /* Construct an array declarator. EXPR is the expression inside [], or
3094 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3095 to the pointer to which a parameter array is converted). STATIC_P is
3096 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3097 is non-zero is the array is [*], a VLA of unspecified length which is
3098 nevertheless a complete type (not currently implemented by GCC),
3099 zero otherwise. The declarator is constructed as an ARRAY_REF
3100 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3101 left of the [] (filled by in set_array_declarator_type) and operand 1
3102 is the expression inside; whose TREE_TYPE is the type qualifiers and
3103 which has TREE_STATIC set if "static" is used. */
3106 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3113 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3114 TREE_TYPE (decl) = quals;
3115 TREE_STATIC (decl) = (static_p ? 1 : 0);
3116 if (pedantic && !flag_isoc99)
3118 if (static_p || quals != NULL_TREE)
3119 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3121 pedwarn ("ISO C89 does not support `[*]' array declarators");
3124 warning ("GCC does not yet properly implement `[*]' array declarators");
3128 /* Set the type of an array declarator. DECL is the declarator, as
3129 constructed by build_array_declarator; TYPE is what appears on the left
3130 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3131 abstract declarator, zero otherwise; this is used to reject static and
3132 type qualifiers in abstract declarators, where they are not in the
3136 set_array_declarator_type (decl, type, abstract_p)
3141 TREE_OPERAND (decl, 0) = type;
3142 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3143 error ("static or type qualifiers in abstract declarator");
3147 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3150 groktypename (typename)
3155 if (TREE_CODE (typename) != TREE_LIST)
3158 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
3160 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
3162 /* Apply attributes. */
3163 decl_attributes (&typename, attrs, 0);
3168 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3171 groktypename_in_parm_context (typename)
3174 if (TREE_CODE (typename) != TREE_LIST)
3176 return grokdeclarator (TREE_VALUE (typename),
3177 TREE_PURPOSE (typename),
3181 /* Decode a declarator in an ordinary declaration or data definition.
3182 This is called as soon as the type information and variable name
3183 have been parsed, before parsing the initializer if any.
3184 Here we create the ..._DECL node, fill in its type,
3185 and put it on the list of decls for the current context.
3186 The ..._DECL node is returned as the value.
3188 Exception: for arrays where the length is not specified,
3189 the type is left null, to be filled in by `finish_decl'.
3191 Function definitions do not come here; they go to start_function
3192 instead. However, external and forward declarations of functions
3193 do go through here. Structure field declarations are done by
3194 grokfield and not through here. */
3197 start_decl (declarator, declspecs, initialized, attributes)
3198 tree declarator, declspecs;
3205 /* An object declared as __attribute__((deprecated)) suppresses
3206 warnings of uses of other deprecated items. */
3207 if (lookup_attribute ("deprecated", attributes))
3208 deprecated_state = DEPRECATED_SUPPRESS;
3210 decl = grokdeclarator (declarator, declspecs,
3211 NORMAL, initialized);
3213 deprecated_state = DEPRECATED_NORMAL;
3215 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3216 && MAIN_NAME_P (DECL_NAME (decl)))
3217 warning_with_decl (decl, "`%s' is usually a function");
3220 /* Is it valid for this decl to have an initializer at all?
3221 If not, set INITIALIZED to zero, which will indirectly
3222 tell `finish_decl' to ignore the initializer once it is parsed. */
3223 switch (TREE_CODE (decl))
3226 /* typedef foo = bar means give foo the same type as bar.
3227 We haven't parsed bar yet, so `finish_decl' will fix that up.
3228 Any other case of an initialization in a TYPE_DECL is an error. */
3229 if (pedantic || list_length (declspecs) > 1)
3231 error ("typedef `%s' is initialized",
3232 IDENTIFIER_POINTER (DECL_NAME (decl)));
3238 error ("function `%s' is initialized like a variable",
3239 IDENTIFIER_POINTER (DECL_NAME (decl)));
3244 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3245 error ("parameter `%s' is initialized",
3246 IDENTIFIER_POINTER (DECL_NAME (decl)));
3251 /* Don't allow initializations for incomplete types
3252 except for arrays which might be completed by the initialization. */
3254 /* This can happen if the array size is an undefined macro. We already
3255 gave a warning, so we don't need another one. */
3256 if (TREE_TYPE (decl) == error_mark_node)
3258 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3260 /* A complete type is ok if size is fixed. */
3262 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3263 || C_DECL_VARIABLE_SIZE (decl))
3265 error ("variable-sized object may not be initialized");
3269 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3271 error ("variable `%s' has initializer but incomplete type",
3272 IDENTIFIER_POINTER (DECL_NAME (decl)));
3275 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3277 error ("elements of array `%s' have incomplete type",
3278 IDENTIFIER_POINTER (DECL_NAME (decl)));
3286 /* Seems redundant with grokdeclarator. */
3287 if (current_binding_level != global_binding_level
3288 && DECL_EXTERNAL (decl)
3289 && TREE_CODE (decl) != FUNCTION_DECL)
3290 warning ("declaration of `%s' has `extern' and is initialized",
3291 IDENTIFIER_POINTER (DECL_NAME (decl)));
3293 DECL_EXTERNAL (decl) = 0;
3294 if (current_binding_level == global_binding_level)
3295 TREE_STATIC (decl) = 1;
3297 /* Tell `pushdecl' this is an initialized decl
3298 even though we don't yet have the initializer expression.
3299 Also tell `finish_decl' it may store the real initializer. */
3300 DECL_INITIAL (decl) = error_mark_node;
3303 /* If this is a function declaration, write a record describing it to the
3304 prototypes file (if requested). */
3306 if (TREE_CODE (decl) == FUNCTION_DECL)
3307 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3309 /* ANSI specifies that a tentative definition which is not merged with
3310 a non-tentative definition behaves exactly like a definition with an
3311 initializer equal to zero. (Section 3.7.2)
3313 -fno-common gives strict ANSI behavior, though this tends to break
3314 a large body of code that grew up without this rule.
3316 Thread-local variables are never common, since there's no entrenched
3317 body of code to break, and it allows more efficient variable references
3318 in the presense of dynamic linking. */
3320 if (TREE_CODE (decl) == VAR_DECL
3322 && TREE_PUBLIC (decl)
3323 && !DECL_THREAD_LOCAL (decl)
3325 DECL_COMMON (decl) = 1;
3327 /* Set attributes here so if duplicate decl, will have proper attributes. */
3328 decl_attributes (&decl, attributes, 0);
3330 /* If #pragma weak was used, mark the decl weak now. */
3331 if (current_binding_level == global_binding_level)
3332 maybe_apply_pragma_weak (decl);
3334 if (TREE_CODE (decl) == FUNCTION_DECL
3335 && DECL_DECLARED_INLINE_P (decl)
3336 && DECL_UNINLINABLE (decl)
3337 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3338 warning_with_decl (decl,
3339 "inline function `%s' given attribute noinline");
3341 /* Add this decl to the current binding level.
3342 TEM may equal DECL or it may be a previous decl of the same name. */
3343 tem = pushdecl (decl);
3345 /* For a local variable, define the RTL now. */
3346 if (current_binding_level != global_binding_level
3347 /* But not if this is a duplicate decl
3348 and we preserved the rtl from the previous one
3349 (which may or may not happen). */
3350 && !DECL_RTL_SET_P (tem)
3351 && !DECL_CONTEXT (tem))
3353 if (TREE_TYPE (tem) != error_mark_node
3354 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3356 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3357 && DECL_INITIAL (tem) != 0)
3364 /* Finish processing of a declaration;
3365 install its initial value.
3366 If the length of an array type is not known before,
3367 it must be determined now, from the initial value, or it is an error. */
3370 finish_decl (decl, init, asmspec_tree)
3374 tree type = TREE_TYPE (decl);
3375 int was_incomplete = (DECL_SIZE (decl) == 0);
3376 const char *asmspec = 0;
3378 /* If a name was specified, get the string. */
3379 if (current_binding_level == global_binding_level)
3380 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3382 asmspec = TREE_STRING_POINTER (asmspec_tree);
3384 /* If `start_decl' didn't like having an initialization, ignore it now. */
3385 if (init != 0 && DECL_INITIAL (decl) == 0)
3388 /* Don't crash if parm is initialized. */
3389 if (TREE_CODE (decl) == PARM_DECL)
3394 if (TREE_CODE (decl) != TYPE_DECL)
3395 store_init_value (decl, init);
3398 /* typedef foo = bar; store the type of bar as the type of foo. */
3399 TREE_TYPE (decl) = TREE_TYPE (init);
3400 DECL_INITIAL (decl) = init = 0;
3404 /* Deduce size of array from initialization, if not already known */
3405 if (TREE_CODE (type) == ARRAY_TYPE
3406 && TYPE_DOMAIN (type) == 0
3407 && TREE_CODE (decl) != TYPE_DECL)
3410 = (TREE_STATIC (decl)
3411 /* Even if pedantic, an external linkage array
3412 may have incomplete type at first. */
3413 ? pedantic && !TREE_PUBLIC (decl)
3414 : !DECL_EXTERNAL (decl));
3416 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3418 /* Get the completed type made by complete_array_type. */
3419 type = TREE_TYPE (decl);
3422 error_with_decl (decl, "initializer fails to determine size of `%s'");
3424 else if (failure == 2)
3427 error_with_decl (decl, "array size missing in `%s'");
3428 /* If a `static' var's size isn't known,
3429 make it extern as well as static, so it does not get
3431 If it is not `static', then do not mark extern;
3432 finish_incomplete_decl will give it a default size
3433 and it will get allocated. */
3434 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3435 DECL_EXTERNAL (decl) = 1;
3438 /* TYPE_MAX_VALUE is always one less than the number of elements
3439 in the array, because we start counting at zero. Therefore,
3440 warn only if the value is less than zero. */
3441 else if (pedantic && TYPE_DOMAIN (type) != 0
3442 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3443 error_with_decl (decl, "zero or negative size array `%s'");
3445 layout_decl (decl, 0);
3448 if (TREE_CODE (decl) == VAR_DECL)
3450 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3451 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3452 layout_decl (decl, 0);
3454 if (DECL_SIZE (decl) == 0
3455 /* Don't give an error if we already gave one earlier. */
3456 && TREE_TYPE (decl) != error_mark_node
3457 && (TREE_STATIC (decl)
3459 /* A static variable with an incomplete type
3460 is an error if it is initialized.
3461 Also if it is not file scope.
3462 Otherwise, let it through, but if it is not `extern'
3463 then it may cause an error message later. */
3464 (DECL_INITIAL (decl) != 0
3465 || DECL_CONTEXT (decl) != 0)
3467 /* An automatic variable with an incomplete type
3469 !DECL_EXTERNAL (decl)))
3471 error_with_decl (decl, "storage size of `%s' isn't known");
3472 TREE_TYPE (decl) = error_mark_node;
3475 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3476 && DECL_SIZE (decl) != 0)
3478 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3479 constant_expression_warning (DECL_SIZE (decl));
3481 error_with_decl (decl, "storage size of `%s' isn't constant");
3484 if (TREE_USED (type))
3485 TREE_USED (decl) = 1;
3488 /* If this is a function and an assembler name is specified, it isn't
3489 builtin any more. Also reset DECL_RTL so we can give it its new
3491 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3493 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3494 SET_DECL_RTL (decl, NULL_RTX);
3495 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3498 /* Output the assembler code and/or RTL code for variables and functions,
3499 unless the type is an undefined structure or union.
3500 If not, it will get done when the type is completed. */
3502 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3504 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3505 maybe_objc_check_decl (decl);
3507 if (!DECL_CONTEXT (decl))
3509 if (DECL_INITIAL (decl) == NULL_TREE
3510 || DECL_INITIAL (decl) == error_mark_node)
3511 /* Don't output anything
3512 when a tentative file-scope definition is seen.
3513 But at end of compilation, do output code for them. */
3514 DECL_DEFER_OUTPUT (decl) = 1;
3515 rest_of_decl_compilation (decl, asmspec,
3516 (DECL_CONTEXT (decl) == 0
3517 || TREE_ASM_WRITTEN (decl)), 0);
3521 /* This is a local variable. If there is an ASMSPEC, the
3522 user has requested that we handle it specially. */
3525 /* In conjunction with an ASMSPEC, the `register'
3526 keyword indicates that we should place the variable
3527 in a particular register. */
3528 if (DECL_REGISTER (decl))
3529 DECL_C_HARD_REGISTER (decl) = 1;
3531 /* If this is not a static variable, issue a warning.
3532 It doesn't make any sense to give an ASMSPEC for an
3533 ordinary, non-register local variable. Historically,
3534 GCC has accepted -- but ignored -- the ASMSPEC in
3536 if (TREE_CODE (decl) == VAR_DECL
3537 && !DECL_REGISTER (decl)
3538 && !TREE_STATIC (decl))
3539 warning_with_decl (decl,
3540 "ignoring asm-specifier for non-static local variable `%s'");
3542 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3545 if (TREE_CODE (decl) != FUNCTION_DECL)
3546 add_decl_stmt (decl);
3549 if (DECL_CONTEXT (decl) != 0)
3551 /* Recompute the RTL of a local array now
3552 if it used to be an incomplete type. */
3554 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3556 /* If we used it already as memory, it must stay in memory. */
3557 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3558 /* If it's still incomplete now, no init will save it. */
3559 if (DECL_SIZE (decl) == 0)
3560 DECL_INITIAL (decl) = 0;
3565 if (TREE_CODE (decl) == TYPE_DECL)
3567 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3568 maybe_objc_check_decl (decl);
3569 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3572 /* At the end of a declaration, throw away any variable type sizes
3573 of types defined inside that declaration. There is no use
3574 computing them in the following function definition. */
3575 if (current_binding_level == global_binding_level)
3576 get_pending_sizes ();
3579 /* Given a parsed parameter declaration,
3580 decode it into a PARM_DECL and push that on the current binding level.
3581 Also, for the sake of forward parm decls,
3582 record the given order of parms in `parm_order'. */
3585 push_parm_decl (parm)
3589 int old_immediate_size_expand = immediate_size_expand;
3590 /* Don't try computing parm sizes now -- wait till fn is called. */
3591 immediate_size_expand = 0;
3593 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3594 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3595 decl_attributes (&decl, TREE_VALUE (parm), 0);
3598 if (DECL_NAME (decl))
3601 olddecl = lookup_name (DECL_NAME (decl));
3602 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3603 pedwarn_with_decl (decl,
3604 "ISO C forbids parameter `%s' shadowing typedef");
3608 decl = pushdecl (decl);
3610 immediate_size_expand = old_immediate_size_expand;
3612 current_binding_level->parm_order
3613 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3615 /* Add this decl to the current binding level. */
3616 finish_decl (decl, NULL_TREE, NULL_TREE);
3619 /* Clear the given order of parms in `parm_order'.
3620 Used at start of parm list,
3621 and also at semicolon terminating forward decls. */
3626 current_binding_level->parm_order = NULL_TREE;
3629 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3630 literal, which may be an incomplete array type completed by the
3631 initializer; INIT is a CONSTRUCTOR that initializes the compound
3635 build_compound_literal (type, init)
3639 /* We do not use start_decl here because we have a type, not a declarator;
3640 and do not use finish_decl because the decl should be stored inside
3641 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3642 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3645 DECL_EXTERNAL (decl) = 0;
3646 TREE_PUBLIC (decl) = 0;
3647 TREE_STATIC (decl) = (current_binding_level == global_binding_level);
3648 DECL_CONTEXT (decl) = current_function_decl;
3649 TREE_USED (decl) = 1;
3650 TREE_TYPE (decl) = type;
3651 store_init_value (decl, init);
3653 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3655 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3660 type = TREE_TYPE (decl);
3661 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3662 return error_mark_node;
3664 stmt = build_stmt (DECL_STMT, decl);
3665 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3666 TREE_SIDE_EFFECTS (complit) = 1;
3668 layout_decl (decl, 0);
3670 if (TREE_STATIC (decl))
3672 /* This decl needs a name for the assembler output. We also need
3673 a unique suffix to be added to the name, for which DECL_CONTEXT
3675 DECL_NAME (decl) = get_identifier ("__compound_literal");
3676 DECL_CONTEXT (decl) = complit;
3677 rest_of_decl_compilation (decl, NULL, 1, 0);
3678 DECL_CONTEXT (decl) = NULL_TREE;
3684 /* Make TYPE a complete type based on INITIAL_VALUE.
3685 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3686 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3689 complete_array_type (type, initial_value, do_default)
3694 tree maxindex = NULL_TREE;
3699 /* Note MAXINDEX is really the maximum index,
3700 one less than the size. */
3701 if (TREE_CODE (initial_value) == STRING_CST)
3704 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3705 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3708 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3710 tree elts = CONSTRUCTOR_ELTS (initial_value);
3711 maxindex = build_int_2 (-1, -1);
3712 for (; elts; elts = TREE_CHAIN (elts))
3714 if (TREE_PURPOSE (elts))
3715 maxindex = TREE_PURPOSE (elts);
3717 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3718 maxindex, integer_one_node));
3720 maxindex = copy_node (maxindex);
3724 /* Make an error message unless that happened already. */
3725 if (initial_value != error_mark_node)
3728 /* Prevent further error messages. */
3729 maxindex = build_int_2 (0, 0);
3736 maxindex = build_int_2 (0, 0);
3742 TYPE_DOMAIN (type) = build_index_type (maxindex);
3743 if (!TREE_TYPE (maxindex))
3744 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3747 /* Lay out the type now that we can get the real answer. */
3754 /* Given declspecs and a declarator,
3755 determine the name and type of the object declared
3756 and construct a ..._DECL node for it.
3757 (In one case we can return a ..._TYPE node instead.
3758 For invalid input we sometimes return 0.)
3760 DECLSPECS is a chain of tree_list nodes whose value fields
3761 are the storage classes and type specifiers.
3763 DECL_CONTEXT says which syntactic context this declaration is in:
3764 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3765 FUNCDEF for a function definition. Like NORMAL but a few different
3766 error messages in each case. Return value may be zero meaning
3767 this definition is too screwy to try to parse.
3768 PARM for a parameter declaration (either within a function prototype
3769 or before a function body). Make a PARM_DECL, or return void_type_node.
3770 TYPENAME if for a typename (in a cast or sizeof).
3771 Don't make a DECL node; just return the ..._TYPE node.
3772 FIELD for a struct or union field; make a FIELD_DECL.
3773 BITFIELD for a field with specified width.
3774 INITIALIZED is 1 if the decl has an initializer.
3776 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3777 It may also be so in the PARM case, for a prototype where the
3778 argument type is specified but not the name.
3780 This function is where the complicated C meanings of `static'
3781 and `extern' are interpreted. */
3784 grokdeclarator (declarator, declspecs, decl_context, initialized)
3787 enum decl_context decl_context;
3792 tree type = NULL_TREE;
3797 int type_quals = TYPE_UNQUALIFIED;
3799 int explicit_int = 0;
3800 int explicit_char = 0;
3801 int defaulted_int = 0;
3802 tree typedef_decl = 0;
3804 tree typedef_type = 0;
3805 int funcdef_flag = 0;
3806 enum tree_code innermost_code = ERROR_MARK;
3808 int size_varies = 0;
3809 tree decl_attr = NULL_TREE;
3810 tree array_ptr_quals = NULL_TREE;
3811 int array_parm_static = 0;
3812 tree returned_attrs = NULL_TREE;
3814 if (decl_context == BITFIELD)
3815 bitfield = 1, decl_context = FIELD;
3817 if (decl_context == FUNCDEF)
3818 funcdef_flag = 1, decl_context = NORMAL;
3820 /* Look inside a declarator for the name being declared
3821 and get it as a string, for an error message. */
3823 tree decl = declarator;
3827 switch (TREE_CODE (decl))
3832 innermost_code = TREE_CODE (decl);
3833 decl = TREE_OPERAND (decl, 0);
3837 decl = TREE_VALUE (decl);
3840 case IDENTIFIER_NODE:
3841 name = IDENTIFIER_POINTER (decl);
3852 /* A function definition's declarator must have the form of
3853 a function declarator. */
3855 if (funcdef_flag && innermost_code != CALL_EXPR)
3858 /* Anything declared one level down from the top level
3859 must be one of the parameters of a function
3860 (because the body is at least two levels down). */
3862 /* If this looks like a function definition, make it one,
3863 even if it occurs where parms are expected.
3864 Then store_parm_decls will reject it and not use it as a parm. */
3865 if (decl_context == NORMAL && !funcdef_flag
3866 && current_binding_level->parm_flag)
3867 decl_context = PARM;
3869 /* Look through the decl specs and record which ones appear.
3870 Some typespecs are defined as built-in typenames.
3871 Others, the ones that are modifiers of other types,
3872 are represented by bits in SPECBITS: set the bits for
3873 the modifiers that appear. Storage class keywords are also in SPECBITS.
3875 If there is a typedef name or a type, store the type in TYPE.
3876 This includes builtin typedefs such as `int'.
3878 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3879 and did not come from a user typedef.
3881 Set LONGLONG if `long' is mentioned twice. */
3883 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3885 tree id = TREE_VALUE (spec);
3887 /* If the entire declaration is itself tagged as deprecated then
3888 suppress reports of deprecated items. */
3889 if (id && TREE_DEPRECATED (id))
3891 if (deprecated_state != DEPRECATED_SUPPRESS)
3892 warn_deprecated_use (id);
3895 if (id == ridpointers[(int) RID_INT])
3897 if (id == ridpointers[(int) RID_CHAR])
3900 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3902 enum rid i = C_RID_CODE (id);
3903 if ((int) i <= (int) RID_LAST_MODIFIER)
3905 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3908 error ("`long long long' is too long for GCC");
3911 if (pedantic && !flag_isoc99 && ! in_system_header
3913 pedwarn ("ISO C89 does not support `long long'");
3917 else if (specbits & (1 << (int) i))
3918 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3920 /* Diagnose "__thread extern". Recall that this list
3921 is in the reverse order seen in the text. */
3923 && (specbits & (1 << (int) RID_EXTERN
3924 | 1 << (int) RID_STATIC)))
3926 if (specbits & 1 << (int) RID_EXTERN)
3927 error ("`__thread' before `extern'");
3929 error ("`__thread' before `static'");
3932 specbits |= 1 << (int) i;
3937 error ("two or more data types in declaration of `%s'", name);
3938 /* Actual typedefs come to us as TYPE_DECL nodes. */
3939 else if (TREE_CODE (id) == TYPE_DECL)
3941 if (TREE_TYPE (id) == error_mark_node)
3942 ; /* Allow the type to default to int to avoid cascading errors. */
3945 type = TREE_TYPE (id);
3946 decl_attr = DECL_ATTRIBUTES (id);
3950 /* Built-in types come as identifiers. */
3951 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3953 tree t = lookup_name (id);
3954 if (TREE_TYPE (t) == error_mark_node)
3956 else if (!t || TREE_CODE (t) != TYPE_DECL)
3957 error ("`%s' fails to be a typedef or built in type",
3958 IDENTIFIER_POINTER (id));
3961 type = TREE_TYPE (t);
3965 else if (TREE_CODE (id) != ERROR_MARK)
3972 typedef_type = type;
3974 size_varies = C_TYPE_VARIABLE_SIZE (type);
3976 /* No type at all: default to `int', and set DEFAULTED_INT
3977 because it was not a user-defined typedef. */
3981 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3982 | (1 << (int) RID_SIGNED)
3983 | (1 << (int) RID_UNSIGNED)
3984 | (1 << (int) RID_COMPLEX))))
3985 /* Don't warn about typedef foo = bar. */
3986 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3987 && ! in_system_header)
3989 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3990 and this is a function, or if -Wimplicit; prefer the former
3991 warning since it is more explicit. */
3992 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3994 warn_about_return_type = 1;
3995 else if (warn_implicit_int || flag_isoc99)
3996 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4001 type = integer_type_node;
4004 /* Now process the modifiers that were specified
4005 and check for invalid combinations. */
4007 /* Long double is a special combination. */
4009 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4010 && TYPE_MAIN_VARIANT (type) == double_type_node)
4012 specbits &= ~(1 << (int) RID_LONG);
4013 type = long_double_type_node;
4016 /* Check all other uses of type modifiers. */
4018 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4019 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4023 if ((specbits & 1 << (int) RID_LONG)
4024 && (specbits & 1 << (int) RID_SHORT))
4025 error ("both long and short specified for `%s'", name);
4026 else if (((specbits & 1 << (int) RID_LONG)
4027 || (specbits & 1 << (int) RID_SHORT))
4029 error ("long or short specified with char for `%s'", name);
4030 else if (((specbits & 1 << (int) RID_LONG)
4031 || (specbits & 1 << (int) RID_SHORT))
4032 && TREE_CODE (type) == REAL_TYPE)
4034 static int already = 0;
4036 error ("long or short specified with floating type for `%s'", name);
4037 if (! already && ! pedantic)
4039 error ("the only valid combination is `long double'");
4043 else if ((specbits & 1 << (int) RID_SIGNED)
4044 && (specbits & 1 << (int) RID_UNSIGNED))
4045 error ("both signed and unsigned specified for `%s'", name);
4046 else if (TREE_CODE (type) != INTEGER_TYPE)
4047 error ("long, short, signed or unsigned invalid for `%s'", name);
4051 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4053 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4055 if (flag_pedantic_errors)
4060 /* Discard the type modifiers if they are invalid. */
4063 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4064 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4069 if ((specbits & (1 << (int) RID_COMPLEX))
4070 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4072 error ("complex invalid for `%s'", name);
4073 specbits &= ~(1 << (int) RID_COMPLEX);
4076 /* Decide whether an integer type is signed or not.
4077 Optionally treat bitfields as signed by default. */
4078 if (specbits & 1 << (int) RID_UNSIGNED
4079 || (bitfield && ! flag_signed_bitfields
4080 && (explicit_int || defaulted_int || explicit_char
4081 /* A typedef for plain `int' without `signed'
4082 can be controlled just like plain `int'. */
4083 || ! (typedef_decl != 0
4084 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4085 && TREE_CODE (type) != ENUMERAL_TYPE
4086 && !(specbits & 1 << (int) RID_SIGNED)))
4089 type = long_long_unsigned_type_node;
4090 else if (specbits & 1 << (int) RID_LONG)
4091 type = long_unsigned_type_node;
4092 else if (specbits & 1 << (int) RID_SHORT)
4093 type = short_unsigned_type_node;
4094 else if (type == char_type_node)
4095 type = unsigned_char_type_node;
4096 else if (typedef_decl)
4097 type = c_common_unsigned_type (type);
4099 type = unsigned_type_node;
4101 else if ((specbits & 1 << (int) RID_SIGNED)
4102 && type == char_type_node)
4103 type = signed_char_type_node;
4105 type = long_long_integer_type_node;
4106 else if (specbits & 1 << (int) RID_LONG)
4107 type = long_integer_type_node;
4108 else if (specbits & 1 << (int) RID_SHORT)
4109 type = short_integer_type_node;
4111 if (specbits & 1 << (int) RID_COMPLEX)
4113 if (pedantic && !flag_isoc99)
4114 pedwarn ("ISO C89 does not support complex types");
4115 /* If we just have "complex", it is equivalent to
4116 "complex double", but if any modifiers at all are specified it is
4117 the complex form of TYPE. E.g, "complex short" is
4118 "complex short int". */
4120 if (defaulted_int && ! longlong
4121 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4122 | (1 << (int) RID_SIGNED)
4123 | (1 << (int) RID_UNSIGNED))))
4126 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4127 type = complex_double_type_node;
4129 else if (type == integer_type_node)
4132 pedwarn ("ISO C does not support complex integer types");
4133 type = complex_integer_type_node;
4135 else if (type == float_type_node)
4136 type = complex_float_type_node;
4137 else if (type == double_type_node)
4138 type = complex_double_type_node;
4139 else if (type == long_double_type_node)
4140 type = complex_long_double_type_node;
4144 pedwarn ("ISO C does not support complex integer types");
4145 type = build_complex_type (type);
4149 /* Figure out the type qualifiers for the declaration. There are
4150 two ways a declaration can become qualified. One is something
4151 like `const int i' where the `const' is explicit. Another is
4152 something like `typedef const int CI; CI i' where the type of the
4153 declaration contains the `const'. */
4154 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4155 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4156 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4157 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4158 if (constp > 1 && ! flag_isoc99)
4159 pedwarn ("duplicate `const'");
4160 if (restrictp > 1 && ! flag_isoc99)
4161 pedwarn ("duplicate `restrict'");
4162 if (volatilep > 1 && ! flag_isoc99)
4163 pedwarn ("duplicate `volatile'");
4164 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4165 type = TYPE_MAIN_VARIANT (type);
4166 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4167 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4168 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4170 /* Warn if two storage classes are given. Default to `auto'. */
4175 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4176 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4177 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4178 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4179 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4181 /* "static __thread" and "extern __thread" are allowed. */
4182 if ((specbits & (1 << (int) RID_THREAD
4183 | 1 << (int) RID_STATIC
4184 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
4187 /* Warn about storage classes that are invalid for certain
4188 kinds of declarations (parameters, typenames, etc.). */
4191 error ("multiple storage classes in declaration of `%s'", name);
4192 else if (funcdef_flag
4194 & ((1 << (int) RID_REGISTER)
4195 | (1 << (int) RID_AUTO)
4196 | (1 << (int) RID_TYPEDEF)
4197 | (1 << (int) RID_THREAD))))
4199 if (specbits & 1 << (int) RID_AUTO
4200 && (pedantic || current_binding_level == global_binding_level))
4201 pedwarn ("function definition declared `auto'");
4202 if (specbits & 1 << (int) RID_REGISTER)
4203 error ("function definition declared `register'");
4204 if (specbits & 1 << (int) RID_TYPEDEF)
4205 error ("function definition declared `typedef'");
4206 if (specbits & 1 << (int) RID_THREAD)
4207 error ("function definition declared `__thread'");
4208 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4209 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
4211 else if (decl_context != NORMAL && nclasses > 0)
4213 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4217 switch (decl_context)
4220 error ("storage class specified for structure field `%s'",
4224 error ("storage class specified for parameter `%s'", name);
4227 error ("storage class specified for typename");
4230 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4231 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4232 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
4235 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4237 /* `extern' with initialization is invalid if not at top level. */
4238 if (current_binding_level == global_binding_level)
4239 warning ("`%s' initialized and declared `extern'", name);
4241 error ("`%s' has both `extern' and initializer", name);
4243 else if (current_binding_level == global_binding_level)
4245 if (specbits & 1 << (int) RID_AUTO)
4246 error ("top-level declaration of `%s' specifies `auto'", name);
4250 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
4251 error ("nested function `%s' declared `extern'", name);
4252 else if ((specbits & (1 << (int) RID_THREAD
4253 | 1 << (int) RID_EXTERN
4254 | 1 << (int) RID_STATIC))
4255 == (1 << (int) RID_THREAD))
4257 error ("function-scope `%s' implicitly auto and declared `__thread'",
4259 specbits &= ~(1 << (int) RID_THREAD);
4264 /* Now figure out the structure of the declarator proper.
4265 Descend through it, creating more complex types, until we reach
4266 the declared identifier (or NULL_TREE, in an absolute declarator). */
4268 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4270 if (type == error_mark_node)
4272 declarator = TREE_OPERAND (declarator, 0);
4276 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4277 an INDIRECT_REF (for *...),
4278 a CALL_EXPR (for ...(...)),
4279 a TREE_LIST (for nested attributes),
4280 an identifier (for the name being declared)
4281 or a null pointer (for the place in an absolute declarator
4282 where the name was omitted).
4283 For the last two cases, we have just exited the loop.
4285 At this point, TYPE is the type of elements of an array,
4286 or for a function to return, or for a pointer to point to.
4287 After this sequence of ifs, TYPE is the type of the
4288 array or function or pointer, and DECLARATOR has had its
4289 outermost layer removed. */
4291 if (array_ptr_quals != NULL_TREE || array_parm_static)
4293 /* Only the innermost declarator (making a parameter be of
4294 array type which is converted to pointer type)
4295 may have static or type qualifiers. */
4296 error ("static or type qualifiers in non-parameter array declarator");
4297 array_ptr_quals = NULL_TREE;
4298 array_parm_static = 0;
4301 if (TREE_CODE (declarator) == TREE_LIST)
4303 /* We encode a declarator with embedded attributes using
4305 tree attrs = TREE_PURPOSE (declarator);
4308 declarator = TREE_VALUE (declarator);
4309 inner_decl = declarator;
4310 while (inner_decl != NULL_TREE
4311 && TREE_CODE (inner_decl) == TREE_LIST)
4312 inner_decl = TREE_VALUE (inner_decl);
4313 if (inner_decl == NULL_TREE
4314 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4315 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4316 else if (TREE_CODE (inner_decl) == CALL_EXPR)
4317 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4318 else if (TREE_CODE (inner_decl) == ARRAY_REF)
4319 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4320 returned_attrs = decl_attributes (&type,
4321 chainon (returned_attrs, attrs),
4324 else if (TREE_CODE (declarator) == ARRAY_REF)
4326 tree itype = NULL_TREE;
4327 tree size = TREE_OPERAND (declarator, 1);
4328 /* The index is a signed object `sizetype' bits wide. */
4329 tree index_type = c_common_signed_type (sizetype);
4331 array_ptr_quals = TREE_TYPE (declarator);
4332 array_parm_static = TREE_STATIC (declarator);
4334 declarator = TREE_OPERAND (declarator, 0);
4336 /* Check for some types that there cannot be arrays of. */
4338 if (VOID_TYPE_P (type))
4340 error ("declaration of `%s' as array of voids", name);
4341 type = error_mark_node;
4344 if (TREE_CODE (type) == FUNCTION_TYPE)
4346 error ("declaration of `%s' as array of functions", name);
4347 type = error_mark_node;
4350 if (size == error_mark_node)
4351 type = error_mark_node;
4353 if (type == error_mark_node)
4356 /* If size was specified, set ITYPE to a range-type for that size.
4357 Otherwise, ITYPE remains null. finish_decl may figure it out
4358 from an initial value. */
4362 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4363 STRIP_TYPE_NOPS (size);
4365 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4367 error ("size of array `%s' has non-integer type", name);
4368 size = integer_one_node;
4371 if (pedantic && integer_zerop (size))
4372 pedwarn ("ISO C forbids zero-size array `%s'", name);
4374 if (TREE_CODE (size) == INTEGER_CST)
4376 constant_expression_warning (size);
4377 if (tree_int_cst_sgn (size) < 0)
4379 error ("size of array `%s' is negative", name);
4380 size = integer_one_node;
4385 /* Make sure the array size remains visibly nonconstant
4386 even if it is (eg) a const variable with known value. */
4389 if (!flag_isoc99 && pedantic)
4391 if (TREE_CONSTANT (size))
4392 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4395 pedwarn ("ISO C89 forbids variable-size array `%s'",
4400 if (integer_zerop (size))
4402 /* A zero-length array cannot be represented with an
4403 unsigned index type, which is what we'll get with
4404 build_index_type. Create an open-ended range instead. */
4405 itype = build_range_type (sizetype, size, NULL_TREE);
4409 /* Compute the maximum valid index, that is, size - 1.
4410 Do the calculation in index_type, so that if it is
4411 a variable the computations will be done in the
4413 itype = fold (build (MINUS_EXPR, index_type,
4414 convert (index_type, size),
4415 convert (index_type, size_one_node)));
4417 /* If that overflowed, the array is too big.
4418 ??? While a size of INT_MAX+1 technically shouldn't
4419 cause an overflow (because we subtract 1), the overflow
4420 is recorded during the conversion to index_type, before
4421 the subtraction. Handling this case seems like an
4422 unnecessary complication. */
4423 if (TREE_OVERFLOW (itype))
4425 error ("size of array `%s' is too large", name);
4426 type = error_mark_node;
4431 itype = variable_size (itype);
4432 itype = build_index_type (itype);
4435 else if (decl_context == FIELD)
4437 if (pedantic && !flag_isoc99 && !in_system_header)
4438 pedwarn ("ISO C89 does not support flexible array members");
4440 /* ISO C99 Flexible array members are effectively identical
4441 to GCC's zero-length array extension. */
4442 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4445 /* If pedantic, complain about arrays of incomplete types. */
4447 if (pedantic && !COMPLETE_TYPE_P (type))
4448 pedwarn ("array type has incomplete element type");
4451 /* We shouldn't have a function type here at all!
4452 Functions aren't allowed as array elements. */
4453 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4454 && (constp || volatilep))
4455 pedwarn ("ISO C forbids const or volatile function types");
4458 /* Build the array type itself, then merge any constancy or
4459 volatility into the target type. We must do it in this order
4460 to ensure that the TYPE_MAIN_VARIANT field of the array type
4461 is set correctly. */
4463 type = build_array_type (type, itype);
4465 type = c_build_qualified_type (type, type_quals);
4468 C_TYPE_VARIABLE_SIZE (type) = 1;
4470 /* The GCC extension for zero-length arrays differs from
4471 ISO flexible array members in that sizeof yields zero. */
4472 if (size && integer_zerop (size))
4475 TYPE_SIZE (type) = bitsize_zero_node;
4476 TYPE_SIZE_UNIT (type) = size_zero_node;
4478 if (decl_context != PARM
4479 && (array_ptr_quals != NULL_TREE || array_parm_static))
4481 error ("static or type qualifiers in non-parameter array declarator");
4482 array_ptr_quals = NULL_TREE;
4483 array_parm_static = 0;
4486 else if (TREE_CODE (declarator) == CALL_EXPR)
4490 /* Declaring a function type.
4491 Make sure we have a valid type for the function to return. */
4492 if (type == error_mark_node)
4497 /* Warn about some types functions can't return. */
4499 if (TREE_CODE (type) == FUNCTION_TYPE)
4501 error ("`%s' declared as function returning a function", name);
4502 type = integer_type_node;
4504 if (TREE_CODE (type) == ARRAY_TYPE)
4506 error ("`%s' declared as function returning an array", name);
4507 type = integer_type_node;
4510 /* Construct the function type and go to the next
4511 inner layer of declarator. */
4513 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4515 /* Say it's a definition
4516 only for the CALL_EXPR
4517 closest to the identifier. */
4518 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4519 /* Type qualifiers before the return type of the function
4520 qualify the return type, not the function type. */
4523 /* Type qualifiers on a function return type are normally
4524 permitted by the standard but have no effect, so give a
4525 warning at -W. Qualifiers on a void return type have
4526 meaning as a GNU extension, and are banned on function
4527 definitions in ISO C. FIXME: strictly we shouldn't
4528 pedwarn for qualified void return types except on function
4529 definitions, but not doing so could lead to the undesirable
4530 state of a "volatile void" function return type not being
4531 warned about, and a use of the function being compiled
4532 with GNU semantics, with no diagnostics under -pedantic. */
4533 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4534 pedwarn ("ISO C forbids qualified void function return type");
4535 else if (extra_warnings
4536 && !(VOID_TYPE_P (type)
4537 && type_quals == TYPE_QUAL_VOLATILE))
4538 warning ("type qualifiers ignored on function return type");
4540 type = c_build_qualified_type (type, type_quals);
4542 type_quals = TYPE_UNQUALIFIED;
4544 type = build_function_type (type, arg_types);
4545 declarator = TREE_OPERAND (declarator, 0);
4547 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4548 the formal parameter list of this FUNCTION_TYPE to point to
4549 the FUNCTION_TYPE node itself. */
4554 for (link = last_function_parm_tags;
4556 link = TREE_CHAIN (link))
4557 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4560 else if (TREE_CODE (declarator) == INDIRECT_REF)
4562 /* Merge any constancy or volatility into the target type
4565 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4567 pedwarn ("ISO C forbids qualified function types");
4569 type = c_build_qualified_type (type, type_quals);
4570 type_quals = TYPE_UNQUALIFIED;
4573 type = build_pointer_type (type);
4575 /* Process a list of type modifier keywords
4576 (such as const or volatile) that were given inside the `*'. */
4578 if (TREE_TYPE (declarator))
4586 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4587 typemodlist = TREE_CHAIN (typemodlist))
4589 tree qualifier = TREE_VALUE (typemodlist);
4591 if (C_IS_RESERVED_WORD (qualifier))
4593 if (C_RID_CODE (qualifier) == RID_CONST)
4595 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4597 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4607 error ("invalid type modifier within pointer declarator");
4608 if (constp > 1 && ! flag_isoc99)
4609 pedwarn ("duplicate `const'");
4610 if (volatilep > 1 && ! flag_isoc99)
4611 pedwarn ("duplicate `volatile'");
4612 if (restrictp > 1 && ! flag_isoc99)
4613 pedwarn ("duplicate `restrict'");
4615 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4616 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4617 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4620 declarator = TREE_OPERAND (declarator, 0);
4627 /* Now TYPE has the actual type. */
4629 /* Did array size calculations overflow? */
4631 if (TREE_CODE (type) == ARRAY_TYPE
4632 && COMPLETE_TYPE_P (type)
4633 && TREE_OVERFLOW (TYPE_SIZE (type)))
4635 error ("size of array `%s' is too large", name);
4636 /* If we proceed with the array type as it is, we'll eventually
4637 crash in tree_low_cst(). */
4638 type = error_mark_node;
4641 /* If this is declaring a typedef name, return a TYPE_DECL. */
4643 if (specbits & (1 << (int) RID_TYPEDEF))
4646 /* Note that the grammar rejects storage classes
4647 in typenames, fields or parameters */
4648 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4650 pedwarn ("ISO C forbids qualified function types");
4652 type = c_build_qualified_type (type, type_quals);
4653 decl = build_decl (TYPE_DECL, declarator, type);
4654 if ((specbits & (1 << (int) RID_SIGNED))
4655 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4656 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4657 decl_attributes (&decl, returned_attrs, 0);
4661 /* Detect the case of an array type of unspecified size
4662 which came, as such, direct from a typedef name.
4663 We must copy the type, so that each identifier gets
4664 a distinct type, so that each identifier's size can be
4665 controlled separately by its own initializer. */
4667 if (type != 0 && typedef_type != 0
4668 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4669 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4671 type = build_array_type (TREE_TYPE (type), 0);
4673 C_TYPE_VARIABLE_SIZE (type) = 1;
4676 /* If this is a type name (such as, in a cast or sizeof),
4677 compute the type and return it now. */
4679 if (decl_context == TYPENAME)
4681 /* Note that the grammar rejects storage classes
4682 in typenames, fields or parameters */
4683 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4685 pedwarn ("ISO C forbids const or volatile function types");
4687 type = c_build_qualified_type (type, type_quals);
4688 decl_attributes (&type, returned_attrs, 0);
4692 /* Aside from typedefs and type names (handle above),
4693 `void' at top level (not within pointer)
4694 is allowed only in public variables.
4695 We don't complain about parms either, but that is because
4696 a better error message can be made later. */
4698 if (VOID_TYPE_P (type) && decl_context != PARM
4699 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4700 && ((specbits & (1 << (int) RID_EXTERN))
4701 || (current_binding_level == global_binding_level
4703 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4705 error ("variable or field `%s' declared void", name);
4706 type = integer_type_node;
4709 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4710 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4715 if (decl_context == PARM)
4717 tree type_as_written;
4720 /* A parameter declared as an array of T is really a pointer to T.
4721 One declared as a function is really a pointer to a function. */
4723 if (TREE_CODE (type) == ARRAY_TYPE)
4725 /* Transfer const-ness of array into that of type pointed to. */
4726 type = TREE_TYPE (type);
4728 type = c_build_qualified_type (type, type_quals);
4729 type = build_pointer_type (type);
4730 type_quals = TYPE_UNQUALIFIED;
4731 if (array_ptr_quals)
4733 tree new_ptr_quals, new_ptr_attrs;
4735 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4736 /* We don't yet implement attributes in this context. */
4737 if (new_ptr_attrs != NULL_TREE)
4738 warning ("attributes in parameter array declarator ignored");
4743 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4745 tree qualifier = TREE_VALUE (new_ptr_quals);
4747 if (C_IS_RESERVED_WORD (qualifier))
4749 if (C_RID_CODE (qualifier) == RID_CONST)
4751 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4753 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4763 error ("invalid type modifier within array declarator");
4765 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4766 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4767 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4771 else if (TREE_CODE (type) == FUNCTION_TYPE)
4773 if (pedantic && type_quals)
4774 pedwarn ("ISO C forbids qualified function types");
4776 type = c_build_qualified_type (type, type_quals);
4777 type = build_pointer_type (type);
4778 type_quals = TYPE_UNQUALIFIED;
4780 else if (type_quals)
4781 type = c_build_qualified_type (type, type_quals);
4783 type_as_written = type;
4785 decl = build_decl (PARM_DECL, declarator, type);
4787 C_DECL_VARIABLE_SIZE (decl) = 1;
4789 /* Compute the type actually passed in the parmlist,
4790 for the case where there is no prototype.
4791 (For example, shorts and chars are passed as ints.)
4792 When there is a prototype, this is overridden later. */
4794 if (type == error_mark_node)
4795 promoted_type = type;
4797 promoted_type = c_type_promotes_to (type);
4799 DECL_ARG_TYPE (decl) = promoted_type;
4800 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4802 else if (decl_context == FIELD)
4804 /* Structure field. It may not be a function. */
4806 if (TREE_CODE (type) == FUNCTION_TYPE)
4808 error ("field `%s' declared as a function", name);
4809 type = build_pointer_type (type);
4811 else if (TREE_CODE (type) != ERROR_MARK
4812 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4814 error ("field `%s' has incomplete type", name);
4815 type = error_mark_node;
4817 /* Move type qualifiers down to element of an array. */
4818 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4820 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4822 TYPE_DOMAIN (type));
4824 /* Leave the field const or volatile as well. */
4825 type_quals = TYPE_UNQUALIFIED;
4828 decl = build_decl (FIELD_DECL, declarator, type);
4829 DECL_NONADDRESSABLE_P (decl) = bitfield;
4832 C_DECL_VARIABLE_SIZE (decl) = 1;
4834 else if (TREE_CODE (type) == FUNCTION_TYPE)
4836 /* Every function declaration is "external"
4837 except for those which are inside a function body
4838 in which `auto' is used.
4839 That is a case not specified by ANSI C,
4840 and we use it for forward declarations for nested functions. */
4841 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4842 || current_binding_level == global_binding_level);
4844 if (specbits & (1 << (int) RID_AUTO)
4845 && (pedantic || current_binding_level == global_binding_level))
4846 pedwarn ("invalid storage class for function `%s'", name);
4847 if (specbits & (1 << (int) RID_REGISTER))
4848 error ("invalid storage class for function `%s'", name);
4849 if (specbits & (1 << (int) RID_THREAD))
4850 error ("invalid storage class for function `%s'", name);
4851 /* Function declaration not at top level.
4852 Storage classes other than `extern' are not allowed
4853 and `extern' makes no difference. */
4854 if (current_binding_level != global_binding_level
4855 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4857 pedwarn ("invalid storage class for function `%s'", name);
4859 decl = build_decl (FUNCTION_DECL, declarator, type);
4860 decl = build_decl_attribute_variant (decl, decl_attr);
4862 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4863 ggc_alloc_cleared (sizeof (struct lang_decl));
4865 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4866 pedwarn ("ISO C forbids qualified function types");
4868 /* GNU C interprets a `volatile void' return type to indicate
4869 that the function does not return. */
4870 if ((type_quals & TYPE_QUAL_VOLATILE)
4871 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4872 warning ("`noreturn' function returns non-void value");
4875 DECL_EXTERNAL (decl) = 1;
4876 /* Record absence of global scope for `static' or `auto'. */
4878 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4881 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4883 /* Record presence of `inline', if it is reasonable. */
4884 if (MAIN_NAME_P (declarator))
4887 warning ("cannot inline function `main'");
4891 /* Assume that otherwise the function can be inlined. */
4892 DECL_DECLARED_INLINE_P (decl) = 1;
4894 /* Do not mark bare declarations as DECL_INLINE. Doing so
4895 in the presence of multiple declarations can result in
4896 the abstract origin pointing between the declarations,
4897 which will confuse dwarf2out. */
4900 DECL_INLINE (decl) = 1;
4901 if (specbits & (1 << (int) RID_EXTERN))
4902 current_extern_inline = 1;
4905 /* If -finline-functions, assume it can be inlined. This does
4906 two things: let the function be deferred until it is actually
4907 needed, and let dwarf2 know that the function is inlinable. */
4908 else if (flag_inline_trees == 2 && initialized)
4910 DECL_INLINE (decl) = 1;
4911 DECL_DECLARED_INLINE_P (decl) = 0;
4916 /* It's a variable. */
4917 /* An uninitialized decl with `extern' is a reference. */
4918 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4920 /* Move type qualifiers down to element of an array. */
4921 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4923 int saved_align = TYPE_ALIGN(type);
4924 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4926 TYPE_DOMAIN (type));
4927 TYPE_ALIGN (type) = saved_align;
4928 #if 0 /* Leave the variable const or volatile as well. */
4929 type_quals = TYPE_UNQUALIFIED;
4932 else if (type_quals)
4933 type = c_build_qualified_type (type, type_quals);
4935 decl = build_decl (VAR_DECL, declarator, type);
4937 C_DECL_VARIABLE_SIZE (decl) = 1;
4940 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4942 DECL_EXTERNAL (decl) = extern_ref;
4944 /* At top level, the presence of a `static' or `register' storage
4945 class specifier, or the absence of all storage class specifiers
4946 makes this declaration a definition (perhaps tentative). Also,
4947 the absence of both `static' and `register' makes it public. */
4948 if (current_binding_level == global_binding_level)
4950 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4951 | (1 << (int) RID_REGISTER)));
4952 TREE_STATIC (decl) = !extern_ref;
4954 /* Not at top level, only `static' makes a static definition. */
4957 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4958 TREE_PUBLIC (decl) = extern_ref;
4961 if (specbits & 1 << (int) RID_THREAD)
4963 if (targetm.have_tls)
4964 DECL_THREAD_LOCAL (decl) = 1;
4966 /* A mere warning is sure to result in improper semantics
4967 at runtime. Don't bother to allow this to compile. */
4968 error ("thread-local storage not supported for this target");
4972 /* Record `register' declaration for warnings on &
4973 and in case doing stupid register allocation. */
4975 if (specbits & (1 << (int) RID_REGISTER))
4976 DECL_REGISTER (decl) = 1;
4978 /* Record constancy and volatility. */
4979 c_apply_type_quals_to_decl (type_quals, decl);
4981 /* If a type has volatile components, it should be stored in memory.
4982 Otherwise, the fact that those components are volatile
4983 will be ignored, and would even crash the compiler. */
4984 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4985 c_mark_addressable (decl);
4987 decl_attributes (&decl, returned_attrs, 0);
4993 /* Decode the parameter-list info for a function type or function definition.
4994 The argument is the value returned by `get_parm_info' (or made in parse.y
4995 if there is an identifier list instead of a parameter decl list).
4996 These two functions are separate because when a function returns
4997 or receives functions then each is called multiple times but the order
4998 of calls is different. The last call to `grokparms' is always the one
4999 that contains the formal parameter names of a function definition.
5001 Store in `last_function_parms' a chain of the decls of parms.
5002 Also store in `last_function_parm_tags' a chain of the struct, union,
5003 and enum tags declared among the parms.
5005 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5007 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5008 a mere declaration. A nonempty identifier-list gets an error message
5009 when FUNCDEF_FLAG is zero. */
5012 grokparms (parms_info, funcdef_flag)
5016 tree first_parm = TREE_CHAIN (parms_info);
5018 last_function_parms = TREE_PURPOSE (parms_info);
5019 last_function_parm_tags = TREE_VALUE (parms_info);
5021 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5022 && !in_system_header)
5023 warning ("function declaration isn't a prototype");
5026 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5029 pedwarn ("parameter names (without types) in function declaration");
5031 last_function_parms = first_parm;
5038 /* We no longer test FUNCDEF_FLAG.
5039 If the arg types are incomplete in a declaration,
5040 they must include undefined tags.
5041 These tags can never be defined in the scope of the declaration,
5042 so the types can never be completed,
5043 and no call can be compiled successfully. */
5045 /* In a fcn definition, arg types must be complete. */
5048 for (parm = last_function_parms, typelt = first_parm;
5050 parm = TREE_CHAIN (parm))
5051 /* Skip over any enumeration constants declared here. */
5052 if (TREE_CODE (parm) == PARM_DECL)
5054 /* Barf if the parameter itself has an incomplete type. */
5055 tree type = TREE_VALUE (typelt);
5056 if (type == error_mark_node)
5058 if (!COMPLETE_TYPE_P (type))
5060 if (funcdef_flag && DECL_NAME (parm) != 0)
5061 error ("parameter `%s' has incomplete type",
5062 IDENTIFIER_POINTER (DECL_NAME (parm)));
5064 warning ("parameter has incomplete type");
5067 TREE_VALUE (typelt) = error_mark_node;
5068 TREE_TYPE (parm) = error_mark_node;
5072 /* This has been replaced by parm_tags_warning, which
5073 uses a more accurate criterion for what to warn
5077 /* Now warn if is a pointer to an incomplete type. */
5078 while (TREE_CODE (type) == POINTER_TYPE
5079 || TREE_CODE (type) == REFERENCE_TYPE)
5080 type = TREE_TYPE (type);
5081 type = TYPE_MAIN_VARIANT (type);
5082 if (!COMPLETE_TYPE_P (type))
5084 if (DECL_NAME (parm) != 0)
5085 warning ("parameter `%s' points to incomplete type",
5086 IDENTIFIER_POINTER (DECL_NAME (parm)));
5088 warning ("parameter points to incomplete type");
5092 typelt = TREE_CHAIN (typelt);
5099 /* Return a tree_list node with info on a parameter list just parsed.
5100 The TREE_PURPOSE is a chain of decls of those parms.
5101 The TREE_VALUE is a list of structure, union and enum tags defined.
5102 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5103 This tree_list node is later fed to `grokparms'.
5105 VOID_AT_END nonzero means append `void' to the end of the type-list.
5106 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5109 get_parm_info (void_at_end)
5115 tree tags = gettags ();
5116 tree parms = getdecls ();
5118 tree order = current_binding_level->parm_order;
5120 /* Just `void' (and no ellipsis) is special. There are really no parms.
5121 But if the `void' is qualified (by `const' or `volatile') or has a
5122 storage class specifier (`register'), then the behavior is undefined;
5123 by not counting it as the special case of `void' we will cause an
5124 error later. Typedefs for `void' are OK (see DR#157). */
5125 if (void_at_end && parms != 0
5126 && TREE_CHAIN (parms) == 0
5127 && VOID_TYPE_P (TREE_TYPE (parms))
5128 && ! TREE_THIS_VOLATILE (parms)
5129 && ! TREE_READONLY (parms)
5130 && ! DECL_REGISTER (parms)
5131 && DECL_NAME (parms) == 0)
5134 storedecls (NULL_TREE);
5135 return tree_cons (NULL_TREE, NULL_TREE,
5136 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5139 /* Extract enumerator values and other non-parms declared with the parms.
5140 Likewise any forward parm decls that didn't have real parm decls. */
5141 for (decl = parms; decl;)
5143 tree next = TREE_CHAIN (decl);
5145 if (TREE_CODE (decl) != PARM_DECL)
5147 TREE_CHAIN (decl) = new_parms;
5150 else if (TREE_ASM_WRITTEN (decl))
5152 error_with_decl (decl,
5153 "parameter `%s' has just a forward declaration");
5154 TREE_CHAIN (decl) = new_parms;
5160 /* Put the parm decls back in the order they were in in the parm list. */
5161 for (t = order; t; t = TREE_CHAIN (t))
5164 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5166 TREE_CHAIN (TREE_VALUE (t)) = 0;
5169 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5172 /* Store the parmlist in the binding level since the old one
5173 is no longer a valid list. (We have changed the chain pointers.) */
5174 storedecls (new_parms);
5176 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5177 /* There may also be declarations for enumerators if an enumeration
5178 type is declared among the parms. Ignore them here. */
5179 if (TREE_CODE (decl) == PARM_DECL)
5181 /* Since there is a prototype,
5182 args are passed in their declared types. */
5183 tree type = TREE_TYPE (decl);
5184 DECL_ARG_TYPE (decl) = type;
5185 if (PROMOTE_PROTOTYPES
5186 && INTEGRAL_TYPE_P (type)
5187 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5188 DECL_ARG_TYPE (decl) = integer_type_node;
5190 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5191 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5192 && DECL_NAME (decl) == 0)
5194 error ("`void' in parameter list must be the entire list");
5200 return tree_cons (new_parms, tags,
5201 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5203 return tree_cons (new_parms, tags, nreverse (types));
5206 /* At end of parameter list, warn about any struct, union or enum tags
5207 defined within. Do so because these types cannot ever become complete. */
5210 parmlist_tags_warning ()
5215 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5217 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5218 /* An anonymous union parm type is meaningful as a GNU extension.
5219 So don't warn for that. */
5220 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5222 if (TREE_PURPOSE (elt) != 0)
5224 if (code == RECORD_TYPE)
5225 warning ("`struct %s' declared inside parameter list",
5226 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5227 else if (code == UNION_TYPE)
5228 warning ("`union %s' declared inside parameter list",
5229 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5231 warning ("`enum %s' declared inside parameter list",
5232 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5236 /* For translation these need to be separate warnings */
5237 if (code == RECORD_TYPE)
5238 warning ("anonymous struct declared inside parameter list");
5239 else if (code == UNION_TYPE)
5240 warning ("anonymous union declared inside parameter list");
5242 warning ("anonymous enum declared inside parameter list");
5246 warning ("its scope is only this definition or declaration, which is probably not what you want");
5252 /* Get the struct, enum or union (CODE says which) with tag NAME.
5253 Define the tag as a forward-reference if it is not defined. */
5256 xref_tag (code, name)
5257 enum tree_code code;
5260 /* If a cross reference is requested, look up the type
5261 already defined for this tag and return it. */
5263 tree ref = lookup_tag (code, name, current_binding_level, 0);
5264 /* If this is the right type of tag, return what we found.
5265 (This reference will be shadowed by shadow_tag later if appropriate.)
5266 If this is the wrong type of tag, do not return it. If it was the
5267 wrong type in the same binding level, we will have had an error
5268 message already; if in a different binding level and declaring
5269 a name, pending_xref_error will give an error message; but if in a
5270 different binding level and not declaring a name, this tag should
5271 shadow the previous declaration of a different type of tag, and
5272 this would not work properly if we return the reference found.
5273 (For example, with "struct foo" in an outer scope, "union foo;"
5274 must shadow that tag with a new one of union type.) */
5275 if (ref && TREE_CODE (ref) == code)
5278 /* If no such tag is yet defined, create a forward-reference node
5279 and record it as the "definition".
5280 When a real declaration of this type is found,
5281 the forward-reference will be altered into a real type. */
5283 ref = make_node (code);
5284 if (code == ENUMERAL_TYPE)
5286 /* Give the type a default layout like unsigned int
5287 to avoid crashing if it does not get defined. */
5288 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5289 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5290 TYPE_USER_ALIGN (ref) = 0;
5291 TREE_UNSIGNED (ref) = 1;
5292 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5293 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5294 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5297 pushtag (name, ref);
5302 /* Make sure that the tag NAME is defined *in the current binding level*
5303 at least as a forward reference.
5304 CODE says which kind of tag NAME ought to be. */
5307 start_struct (code, name)
5308 enum tree_code code;
5311 /* If there is already a tag defined at this binding level
5312 (as a forward reference), just return it. */
5317 ref = lookup_tag (code, name, current_binding_level, 1);
5318 if (ref && TREE_CODE (ref) == code)
5320 C_TYPE_BEING_DEFINED (ref) = 1;
5321 TYPE_PACKED (ref) = flag_pack_struct;
5322 if (TYPE_FIELDS (ref))
5324 if (code == UNION_TYPE)
5325 error ("redefinition of `union %s'",
5326 IDENTIFIER_POINTER (name));
5328 error ("redefinition of `struct %s'",
5329 IDENTIFIER_POINTER (name));
5335 /* Otherwise create a forward-reference just so the tag is in scope. */
5337 ref = make_node (code);
5338 pushtag (name, ref);
5339 C_TYPE_BEING_DEFINED (ref) = 1;
5340 TYPE_PACKED (ref) = flag_pack_struct;
5344 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5345 of a structure component, returning a FIELD_DECL node.
5346 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5348 This is done during the parsing of the struct declaration.
5349 The FIELD_DECL nodes are chained together and the lot of them
5350 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5353 grokfield (filename, line, declarator, declspecs, width)
5354 const char *filename ATTRIBUTE_UNUSED;
5355 int line ATTRIBUTE_UNUSED;
5356 tree declarator, declspecs, width;
5360 if (declarator == NULL_TREE && width == NULL_TREE)
5362 /* This is an unnamed decl. We only support unnamed
5363 structs/unions, so check for other things and refuse them. */
5364 if (TREE_CODE (TREE_VALUE (declspecs)) != RECORD_TYPE
5365 && TREE_CODE (TREE_VALUE (declspecs)) != UNION_TYPE)
5367 error ("unnamed fields of type other than struct or union are not allowed");
5372 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5374 finish_decl (value, NULL_TREE, NULL_TREE);
5375 DECL_INITIAL (value) = width;
5377 maybe_objc_check_decl (value);
5381 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5382 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5383 ATTRIBUTES are attributes to be applied to the structure. */
5386 finish_struct (t, fieldlist, attributes)
5392 int toplevel = global_binding_level == current_binding_level;
5393 int saw_named_field;
5395 /* If this type was previously laid out as a forward reference,
5396 make sure we lay it out again. */
5400 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5402 /* Nameless union parm types are useful as GCC extension. */
5403 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5404 /* Otherwise, warn about any struct or union def. in parmlist. */
5405 if (in_parm_level_p ())
5408 pedwarn ("%s defined inside parms",
5409 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5411 warning ("%s defined inside parms",
5412 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5417 for (x = fieldlist; x; x = TREE_CHAIN (x))
5418 if (DECL_NAME (x) != 0)
5422 pedwarn ("%s has no %s",
5423 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5424 fieldlist ? _("named members") : _("members"));
5427 /* Install struct as DECL_CONTEXT of each field decl.
5428 Also process specified field sizes,m which is found in the DECL_INITIAL.
5429 Store 0 there, except for ": 0" fields (so we can find them
5430 and delete them, below). */
5432 saw_named_field = 0;
5433 for (x = fieldlist; x; x = TREE_CHAIN (x))
5435 DECL_CONTEXT (x) = t;
5436 DECL_PACKED (x) |= TYPE_PACKED (t);
5438 /* If any field is const, the structure type is pseudo-const. */
5439 if (TREE_READONLY (x))
5440 C_TYPE_FIELDS_READONLY (t) = 1;
5443 /* A field that is pseudo-const makes the structure likewise. */
5444 tree t1 = TREE_TYPE (x);
5445 while (TREE_CODE (t1) == ARRAY_TYPE)
5446 t1 = TREE_TYPE (t1);
5447 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5448 && C_TYPE_FIELDS_READONLY (t1))
5449 C_TYPE_FIELDS_READONLY (t) = 1;
5452 /* Any field that is volatile means variables of this type must be
5453 treated in some ways as volatile. */
5454 if (TREE_THIS_VOLATILE (x))
5455 C_TYPE_FIELDS_VOLATILE (t) = 1;
5457 /* Any field of nominal variable size implies structure is too. */
5458 if (C_DECL_VARIABLE_SIZE (x))
5459 C_TYPE_VARIABLE_SIZE (t) = 1;
5461 /* Detect invalid nested redefinition. */
5462 if (TREE_TYPE (x) == t)
5463 error ("nested redefinition of `%s'",
5464 IDENTIFIER_POINTER (TYPE_NAME (t)));
5466 /* Detect invalid bit-field size. */
5467 if (DECL_INITIAL (x))
5468 STRIP_NOPS (DECL_INITIAL (x));
5469 if (DECL_INITIAL (x))
5471 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5472 constant_expression_warning (DECL_INITIAL (x));
5476 "bit-field `%s' width not an integer constant");
5477 DECL_INITIAL (x) = NULL;
5481 /* Detect invalid bit-field type. */
5482 if (DECL_INITIAL (x)
5483 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5484 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5485 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5487 error_with_decl (x, "bit-field `%s' has invalid type");
5488 DECL_INITIAL (x) = NULL;
5491 if (DECL_INITIAL (x) && pedantic
5492 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5493 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5494 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5495 /* Accept an enum that's equivalent to int or unsigned int. */
5496 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5497 && (TYPE_PRECISION (TREE_TYPE (x))
5498 == TYPE_PRECISION (integer_type_node))))
5499 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5501 /* Detect and ignore out of range field width and process valid
5503 if (DECL_INITIAL (x))
5506 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
5507 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5509 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5510 error_with_decl (x, "negative width in bit-field `%s'");
5511 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5512 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5513 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5514 error_with_decl (x, "zero width for bit-field `%s'");
5517 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5518 unsigned HOST_WIDE_INT width
5519 = tree_low_cst (DECL_INITIAL (x), 1);
5521 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5522 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5523 TREE_UNSIGNED (TREE_TYPE (x)))
5525 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5526 TREE_UNSIGNED (TREE_TYPE (x))))))
5527 warning_with_decl (x,
5528 "`%s' is narrower than values of its type");
5530 DECL_SIZE (x) = bitsize_int (width);
5531 DECL_BIT_FIELD (x) = 1;
5532 SET_DECL_C_BIT_FIELD (x);
5535 && ! (* targetm.ms_bitfield_layout_p) (t))
5537 /* field size 0 => force desired amount of alignment. */
5538 #ifdef EMPTY_FIELD_BOUNDARY
5539 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5541 #ifdef PCC_BITFIELD_TYPE_MATTERS
5542 if (PCC_BITFIELD_TYPE_MATTERS)
5544 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5545 TYPE_ALIGN (TREE_TYPE (x)));
5546 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5553 else if (TREE_TYPE (x) != error_mark_node)
5555 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5556 : TYPE_ALIGN (TREE_TYPE (x)));
5558 /* Non-bit-fields are aligned for their type, except packed
5559 fields which require only BITS_PER_UNIT alignment. */
5560 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5561 if (! DECL_PACKED (x))
5562 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5565 DECL_INITIAL (x) = 0;
5567 /* Detect flexible array member in an invalid context. */
5568 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5569 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5570 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5571 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5573 if (TREE_CODE (t) == UNION_TYPE)
5574 error_with_decl (x, "flexible array member in union");
5575 else if (TREE_CHAIN (x) != NULL_TREE)
5576 error_with_decl (x, "flexible array member not at end of struct");
5577 else if (! saw_named_field)
5578 error_with_decl (x, "flexible array member in otherwise empty struct");
5581 saw_named_field = 1;
5584 /* Delete all duplicate fields from the fieldlist */
5585 for (x = fieldlist; x && TREE_CHAIN (x);)
5586 /* Anonymous fields aren't duplicates. */
5587 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5595 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5601 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5603 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5604 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5610 /* Now we have the nearly final fieldlist. Record it,
5611 then lay out the structure or union (including the fields). */
5613 TYPE_FIELDS (t) = fieldlist;
5617 /* Delete all zero-width bit-fields from the fieldlist */
5619 tree *fieldlistp = &fieldlist;
5621 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5622 *fieldlistp = TREE_CHAIN (*fieldlistp);
5624 fieldlistp = &TREE_CHAIN (*fieldlistp);
5627 /* Now we have the truly final field list.
5628 Store it in this type and in the variants. */
5630 TYPE_FIELDS (t) = fieldlist;
5632 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5634 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5635 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5636 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5637 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5640 /* If this was supposed to be a transparent union, but we can't
5641 make it one, warn and turn off the flag. */
5642 if (TREE_CODE (t) == UNION_TYPE
5643 && TYPE_TRANSPARENT_UNION (t)
5644 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5646 TYPE_TRANSPARENT_UNION (t) = 0;
5647 warning ("union cannot be made transparent");
5650 /* If this structure or union completes the type of any previous
5651 variable declaration, lay it out and output its rtl. */
5653 if (current_binding_level->incomplete_list != NULL_TREE)
5655 tree prev = NULL_TREE;
5657 for (x = current_binding_level->incomplete_list; x; x = TREE_CHAIN (x))
5659 tree decl = TREE_VALUE (x);
5661 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5662 && TREE_CODE (decl) != TYPE_DECL)
5664 layout_decl (decl, 0);
5665 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5666 maybe_objc_check_decl (decl);
5667 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5670 /* Unlink X from the incomplete list. */
5672 TREE_CHAIN (prev) = TREE_CHAIN (x);
5674 current_binding_level->incomplete_list = TREE_CHAIN (x);
5676 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5677 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5679 tree element = TREE_TYPE (decl);
5680 while (TREE_CODE (element) == ARRAY_TYPE)
5681 element = TREE_TYPE (element);
5684 layout_array_type (TREE_TYPE (decl));
5685 if (TREE_CODE (decl) != TYPE_DECL)
5687 layout_decl (decl, 0);
5688 maybe_objc_check_decl (decl);
5689 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5693 /* Unlink X from the incomplete list. */
5695 TREE_CHAIN (prev) = TREE_CHAIN (x);
5697 current_binding_level->incomplete_list = TREE_CHAIN (x);
5703 /* Finish debugging output for this type. */
5704 rest_of_type_compilation (t, toplevel);
5709 /* Lay out the type T, and its element type, and so on. */
5712 layout_array_type (t)
5715 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5716 layout_array_type (TREE_TYPE (t));
5720 /* Begin compiling the definition of an enumeration type.
5721 NAME is its name (or null if anonymous).
5722 Returns the type object, as yet incomplete.
5723 Also records info about it so that build_enumerator
5724 may be used to declare the individual values as they are read. */
5732 /* If this is the real definition for a previous forward reference,
5733 fill in the contents in the same object that used to be the
5734 forward reference. */
5737 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5739 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5741 enumtype = make_node (ENUMERAL_TYPE);
5742 pushtag (name, enumtype);
5745 C_TYPE_BEING_DEFINED (enumtype) = 1;
5747 if (TYPE_VALUES (enumtype) != 0)
5749 /* This enum is a named one that has been declared already. */
5750 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5752 /* Completely replace its old definition.
5753 The old enumerators remain defined, however. */
5754 TYPE_VALUES (enumtype) = 0;
5757 enum_next_value = integer_zero_node;
5760 if (flag_short_enums)
5761 TYPE_PACKED (enumtype) = 1;
5766 /* After processing and defining all the values of an enumeration type,
5767 install their decls in the enumeration type and finish it off.
5768 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5769 and ATTRIBUTES are the specified attributes.
5770 Returns ENUMTYPE. */
5773 finish_enum (enumtype, values, attributes)
5779 tree minnode = 0, maxnode = 0, enum_value_type;
5780 int precision, unsign;
5781 int toplevel = (global_binding_level == current_binding_level);
5783 if (in_parm_level_p ())
5784 warning ("enum defined inside parms");
5786 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5788 /* Calculate the maximum value of any enumerator in this type. */
5790 if (values == error_mark_node)
5791 minnode = maxnode = integer_zero_node;
5794 minnode = maxnode = TREE_VALUE (values);
5795 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5797 tree value = TREE_VALUE (pair);
5798 if (tree_int_cst_lt (maxnode, value))
5800 if (tree_int_cst_lt (value, minnode))
5805 /* Construct the final type of this enumeration. It is the same
5806 as one of the integral types - the narrowest one that fits, except
5807 that normally we only go as narrow as int - and signed iff any of
5808 the values are negative. */
5809 unsign = (tree_int_cst_sgn (minnode) >= 0);
5810 precision = MAX (min_precision (minnode, unsign),
5811 min_precision (maxnode, unsign));
5812 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5814 tree narrowest = c_common_type_for_size (precision, unsign);
5817 warning ("enumeration values exceed range of largest integer");
5818 narrowest = long_long_integer_type_node;
5821 precision = TYPE_PRECISION (narrowest);
5824 precision = TYPE_PRECISION (integer_type_node);
5826 if (precision == TYPE_PRECISION (integer_type_node))
5827 enum_value_type = c_common_type_for_size (precision, 0);
5829 enum_value_type = enumtype;
5831 TYPE_MIN_VALUE (enumtype) = minnode;
5832 TYPE_MAX_VALUE (enumtype) = maxnode;
5833 TYPE_PRECISION (enumtype) = precision;
5834 TREE_UNSIGNED (enumtype) = unsign;
5835 TYPE_SIZE (enumtype) = 0;
5836 layout_type (enumtype);
5838 if (values != error_mark_node)
5840 /* Change the type of the enumerators to be the enum type. We
5841 need to do this irrespective of the size of the enum, for
5842 proper type checking. Replace the DECL_INITIALs of the
5843 enumerators, and the value slots of the list, with copies
5844 that have the enum type; they cannot be modified in place
5845 because they may be shared (e.g. integer_zero_node) Finally,
5846 change the purpose slots to point to the names of the decls. */
5847 for (pair = values; pair; pair = TREE_CHAIN (pair))
5849 tree enu = TREE_PURPOSE (pair);
5851 TREE_TYPE (enu) = enumtype;
5852 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5853 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5854 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5855 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5856 DECL_MODE (enu) = TYPE_MODE (enumtype);
5858 /* The ISO C Standard mandates enumerators to have type int,
5859 even though the underlying type of an enum type is
5860 unspecified. Here we convert any enumerators that fit in
5861 an int to type int, to avoid promotions to unsigned types
5862 when comparing integers with enumerators that fit in the
5863 int range. When -pedantic is given, build_enumerator()
5864 would have already taken care of those that don't fit. */
5865 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5866 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5868 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5870 TREE_PURPOSE (pair) = DECL_NAME (enu);
5871 TREE_VALUE (pair) = DECL_INITIAL (enu);
5874 TYPE_VALUES (enumtype) = values;
5877 /* Fix up all variant types of this enum type. */
5878 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5880 if (tem == enumtype)
5882 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5883 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5884 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5885 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5886 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5887 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5888 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5889 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5890 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5891 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5894 /* Finish debugging output for this type. */
5895 rest_of_type_compilation (enumtype, toplevel);
5900 /* Build and install a CONST_DECL for one value of the
5901 current enumeration type (one that was begun with start_enum).
5902 Return a tree-list containing the CONST_DECL and its value.
5903 Assignment of sequential values by default is handled here. */
5906 build_enumerator (name, value)
5911 /* Validate and default VALUE. */
5913 /* Remove no-op casts from the value. */
5915 STRIP_TYPE_NOPS (value);
5919 if (TREE_CODE (value) == INTEGER_CST)
5921 value = default_conversion (value);
5922 constant_expression_warning (value);
5926 error ("enumerator value for `%s' not integer constant",
5927 IDENTIFIER_POINTER (name));
5932 /* Default based on previous value. */
5933 /* It should no longer be possible to have NON_LVALUE_EXPR
5937 value = enum_next_value;
5939 error ("overflow in enumeration values");
5942 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5944 pedwarn ("ISO C restricts enumerator values to range of `int'");
5945 value = convert (integer_type_node, value);
5948 /* Set basis for default for next value. */
5949 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5950 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5952 /* Now create a declaration for the enum value name. */
5954 type = TREE_TYPE (value);
5955 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5956 TYPE_PRECISION (integer_type_node)),
5957 (TYPE_PRECISION (type)
5958 >= TYPE_PRECISION (integer_type_node)
5959 && TREE_UNSIGNED (type)));
5961 decl = build_decl (CONST_DECL, name, type);
5962 DECL_INITIAL (decl) = convert (type, value);
5965 return tree_cons (decl, value, NULL_TREE);
5969 /* Create the FUNCTION_DECL for a function definition.
5970 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5971 the declaration; they describe the function's name and the type it returns,
5972 but twisted together in a fashion that parallels the syntax of C.
5974 This function creates a binding context for the function body
5975 as well as setting up the FUNCTION_DECL in current_function_decl.
5977 Returns 1 on success. If the DECLARATOR is not suitable for a function
5978 (it defines a datum instead), we return 0, which tells
5979 yyparse to report a parse error. */
5982 start_function (declspecs, declarator, attributes)
5983 tree declarator, declspecs, attributes;
5985 tree decl1, old_decl;
5987 int old_immediate_size_expand = immediate_size_expand;
5989 current_function_returns_value = 0; /* Assume, until we see it does. */
5990 current_function_returns_null = 0;
5991 current_function_returns_abnormally = 0;
5992 warn_about_return_type = 0;
5993 current_extern_inline = 0;
5994 c_function_varargs = 0;
5996 shadowed_labels = 0;
5998 /* Don't expand any sizes in the return type of the function. */
5999 immediate_size_expand = 0;
6001 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6003 /* If the declarator is not suitable for a function definition,
6004 cause a syntax error. */
6007 immediate_size_expand = old_immediate_size_expand;
6011 decl_attributes (&decl1, attributes, 0);
6013 /* If #pragma weak was used, mark the decl weak now. */
6014 if (current_binding_level == global_binding_level)
6015 maybe_apply_pragma_weak (decl1);
6017 if (DECL_DECLARED_INLINE_P (decl1)
6018 && DECL_UNINLINABLE (decl1)
6019 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6020 warning_with_decl (decl1,
6021 "inline function `%s' given attribute noinline");
6023 announce_function (decl1);
6025 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6027 error ("return type is an incomplete type");
6028 /* Make it return void instead. */
6030 = build_function_type (void_type_node,
6031 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6034 if (warn_about_return_type)
6035 pedwarn_c99 ("return type defaults to `int'");
6037 /* Save the parm names or decls from this function's declarator
6038 where store_parm_decls will find them. */
6039 current_function_parms = last_function_parms;
6040 current_function_parm_tags = last_function_parm_tags;
6042 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6043 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6044 DECL_INITIAL (decl1) = error_mark_node;
6046 /* If this definition isn't a prototype and we had a prototype declaration
6047 before, copy the arg type info from that prototype.
6048 But not if what we had before was a builtin function. */
6049 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6050 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6051 && !DECL_BUILT_IN (old_decl)
6052 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6053 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6054 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6056 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6057 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6058 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6061 /* If there is no explicit declaration, look for any out-of-scope implicit
6064 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6066 /* Optionally warn of old-fashioned def with no previous prototype. */
6067 if (warn_strict_prototypes
6068 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6070 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6071 || (DECL_BUILT_IN (old_decl)
6072 && ! C_DECL_ANTICIPATED (old_decl)))))
6073 warning ("function declaration isn't a prototype");
6074 /* Optionally warn of any global def with no previous prototype. */
6075 else if (warn_missing_prototypes
6076 && TREE_PUBLIC (decl1)
6078 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6079 || (DECL_BUILT_IN (old_decl)
6080 && ! C_DECL_ANTICIPATED (old_decl))))
6081 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6082 warning_with_decl (decl1, "no previous prototype for `%s'");
6083 /* Optionally warn of any def with no previous prototype
6084 if the function has already been used. */
6085 else if (warn_missing_prototypes
6086 && old_decl != 0 && TREE_USED (old_decl)
6087 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6088 warning_with_decl (decl1,
6089 "`%s' was used with no prototype before its definition");
6090 /* Optionally warn of any global def with no previous declaration. */
6091 else if (warn_missing_declarations
6092 && TREE_PUBLIC (decl1)
6094 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6095 warning_with_decl (decl1, "no previous declaration for `%s'");
6096 /* Optionally warn of any def with no previous declaration
6097 if the function has already been used. */
6098 else if (warn_missing_declarations
6099 && old_decl != 0 && TREE_USED (old_decl)
6100 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6101 warning_with_decl (decl1,
6102 "`%s' was used with no declaration before its definition");
6104 /* This is a definition, not a reference.
6105 So normally clear DECL_EXTERNAL.
6106 However, `extern inline' acts like a declaration
6107 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6108 DECL_EXTERNAL (decl1) = current_extern_inline;
6110 /* This function exists in static storage.
6111 (This does not mean `static' in the C sense!) */
6112 TREE_STATIC (decl1) = 1;
6114 /* A nested function is not global. */
6115 if (current_function_decl != 0)
6116 TREE_PUBLIC (decl1) = 0;
6118 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6119 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6124 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6125 != integer_type_node)
6126 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6128 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6129 args = TREE_CHAIN (args))
6131 tree type = args ? TREE_VALUE (args) : 0;
6133 if (type == void_type_node)
6140 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6141 pedwarn_with_decl (decl1,
6142 "first argument of `%s' should be `int'");
6146 if (TREE_CODE (type) != POINTER_TYPE
6147 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6148 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6150 pedwarn_with_decl (decl1,
6151 "second argument of `%s' should be `char **'");
6155 if (TREE_CODE (type) != POINTER_TYPE
6156 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6157 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6159 pedwarn_with_decl (decl1,
6160 "third argument of `%s' should probably be `char **'");
6165 /* It is intentional that this message does not mention the third
6166 argument because it's only mentioned in an appendix of the
6168 if (argct > 0 && (argct < 2 || argct > 3))
6169 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6171 if (! TREE_PUBLIC (decl1))
6172 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6175 /* Record the decl so that the function name is defined.
6176 If we already have a decl for this name, and it is a FUNCTION_DECL,
6177 use the old decl. */
6179 current_function_decl = pushdecl (decl1);
6182 declare_parm_level (1);
6183 current_binding_level->subblocks_tag_transparent = 1;
6185 make_decl_rtl (current_function_decl, NULL);
6187 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6188 /* Promote the value to int before returning it. */
6189 if (c_promoting_integer_type_p (restype))
6191 /* It retains unsignedness if not really getting wider. */
6192 if (TREE_UNSIGNED (restype)
6193 && (TYPE_PRECISION (restype)
6194 == TYPE_PRECISION (integer_type_node)))
6195 restype = unsigned_type_node;
6197 restype = integer_type_node;
6199 DECL_RESULT (current_function_decl)
6200 = build_decl (RESULT_DECL, NULL_TREE, restype);
6202 /* If this fcn was already referenced via a block-scope `extern' decl
6203 (or an implicit decl), propagate certain information about the usage. */
6204 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6205 TREE_ADDRESSABLE (current_function_decl) = 1;
6207 immediate_size_expand = old_immediate_size_expand;
6209 start_fname_decls ();
6214 /* Record that this function is going to be a varargs function.
6215 This is called before store_parm_decls, which is too early
6216 to call mark_varargs directly. */
6221 c_function_varargs = 1;
6224 /* Store the parameter declarations into the current function declaration.
6225 This is called after parsing the parameter declarations, before
6226 digesting the body of the function.
6228 For an old-style definition, modify the function's type
6229 to specify at least the number of arguments. */
6234 tree fndecl = current_function_decl;
6237 /* This is either a chain of PARM_DECLs (if a prototype was used)
6238 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6239 tree specparms = current_function_parms;
6241 /* This is a list of types declared among parms in a prototype. */
6242 tree parmtags = current_function_parm_tags;
6244 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6245 tree parmdecls = getdecls ();
6247 /* This is a chain of any other decls that came in among the parm
6248 declarations. If a parm is declared with enum {foo, bar} x;
6249 then CONST_DECLs for foo and bar are put here. */
6252 /* The function containing FNDECL, if any. */
6253 tree context = decl_function_context (fndecl);
6255 /* Nonzero if this definition is written with a prototype. */
6258 int saved_warn_shadow = warn_shadow;
6260 /* Don't re-emit shadow warnings. */
6263 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6265 /* This case is when the function was defined with an ANSI prototype.
6266 The parms already have decls, so we need not do anything here
6267 except record them as in effect
6268 and complain if any redundant old-style parm decls were written. */
6279 error_with_decl (fndecl,
6280 "parm types given both in parmlist and separately");
6281 /* Get rid of the erroneous decls; don't keep them on
6282 the list of parms, since they might not be PARM_DECLs. */
6283 for (decl = current_binding_level->names;
6284 decl; decl = TREE_CHAIN (decl))
6285 if (DECL_NAME (decl))
6286 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6287 for (link = current_binding_level->shadowed;
6288 link; link = TREE_CHAIN (link))
6289 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6290 current_binding_level->names = 0;
6291 current_binding_level->shadowed = 0;
6294 specparms = nreverse (specparms);
6295 for (parm = specparms; parm; parm = next)
6297 next = TREE_CHAIN (parm);
6298 if (TREE_CODE (parm) == PARM_DECL)
6300 if (DECL_NAME (parm) == 0)
6301 error_with_decl (parm, "parameter name omitted");
6302 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6303 && VOID_TYPE_P (TREE_TYPE (parm)))
6305 error_with_decl (parm, "parameter `%s' declared void");
6306 /* Change the type to error_mark_node so this parameter
6307 will be ignored by assign_parms. */
6308 TREE_TYPE (parm) = error_mark_node;
6314 /* If we find an enum constant or a type tag,
6315 put it aside for the moment. */
6316 TREE_CHAIN (parm) = 0;
6317 others = chainon (others, parm);
6321 /* Get the decls in their original chain order
6322 and record in the function. */
6323 DECL_ARGUMENTS (fndecl) = getdecls ();
6326 /* If this function takes a variable number of arguments,
6327 add a phony parameter to the end of the parm list,
6328 to represent the position of the first unnamed argument. */
6329 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6332 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6333 /* Let's hope the address of the unnamed parm
6334 won't depend on its type. */
6335 TREE_TYPE (dummy) = integer_type_node;
6336 DECL_ARG_TYPE (dummy) = integer_type_node;
6337 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6341 /* Now pushdecl the enum constants. */
6342 for (parm = others; parm; parm = next)
6344 next = TREE_CHAIN (parm);
6345 if (DECL_NAME (parm) == 0)
6347 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6349 else if (TREE_CODE (parm) != PARM_DECL)
6353 storetags (chainon (parmtags, gettags ()));
6357 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6358 each with a parm name as the TREE_VALUE.
6360 PARMDECLS is a chain of declarations for parameters.
6361 Warning! It can also contain CONST_DECLs which are not parameters
6362 but are names of enumerators of any enum types
6363 declared among the parameters.
6365 First match each formal parameter name with its declaration.
6366 Associate decls with the names and store the decls
6367 into the TREE_PURPOSE slots. */
6369 /* We use DECL_WEAK as a flag to show which parameters have been
6370 seen already since it is not used on PARM_DECL or CONST_DECL. */
6371 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6372 DECL_WEAK (parm) = 0;
6374 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6376 tree tail, found = NULL;
6378 if (TREE_VALUE (parm) == 0)
6380 error_with_decl (fndecl,
6381 "parameter name missing from parameter list");
6382 TREE_PURPOSE (parm) = 0;
6386 /* See if any of the parmdecls specifies this parm by name.
6387 Ignore any enumerator decls. */
6388 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6389 if (DECL_NAME (tail) == TREE_VALUE (parm)
6390 && TREE_CODE (tail) == PARM_DECL)
6396 /* If declaration already marked, we have a duplicate name.
6397 Complain, and don't use this decl twice. */
6398 if (found && DECL_WEAK (found))
6400 error_with_decl (found, "multiple parameters named `%s'");
6404 /* If the declaration says "void", complain and ignore it. */
6405 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6407 error_with_decl (found, "parameter `%s' declared void");
6408 TREE_TYPE (found) = integer_type_node;
6409 DECL_ARG_TYPE (found) = integer_type_node;
6410 layout_decl (found, 0);
6413 /* If no declaration found, default to int. */
6416 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6418 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6419 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6420 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6422 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6423 else if (extra_warnings)
6424 warning_with_decl (found, "type of `%s' defaults to `int'");
6428 TREE_PURPOSE (parm) = found;
6430 /* Mark this decl as "already found". */
6431 DECL_WEAK (found) = 1;
6434 /* Put anything which is on the parmdecls chain and which is
6435 not a PARM_DECL onto the list NONPARMS. (The types of
6436 non-parm things which might appear on the list include
6437 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6438 any actual PARM_DECLs not matched with any names. */
6441 for (parm = parmdecls; parm;)
6443 tree next = TREE_CHAIN (parm);
6444 TREE_CHAIN (parm) = 0;
6446 if (TREE_CODE (parm) != PARM_DECL)
6447 nonparms = chainon (nonparms, parm);
6450 /* Complain about args with incomplete types. */
6451 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6453 error_with_decl (parm, "parameter `%s' has incomplete type");
6454 TREE_TYPE (parm) = error_mark_node;
6457 if (! DECL_WEAK (parm))
6459 error_with_decl (parm,
6460 "declaration for parameter `%s' but no such parameter");
6461 /* Pretend the parameter was not missing.
6462 This gets us to a standard state and minimizes
6463 further error messages. */
6465 = chainon (specparms,
6466 tree_cons (parm, NULL_TREE, NULL_TREE));
6473 /* Chain the declarations together in the order of the list of
6474 names. Store that chain in the function decl, replacing the
6477 DECL_ARGUMENTS (fndecl) = 0;
6480 for (last = 0; parm; parm = TREE_CHAIN (parm))
6481 if (TREE_PURPOSE (parm))
6484 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6486 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6487 last = TREE_PURPOSE (parm);
6488 TREE_CHAIN (last) = 0;
6492 /* If there was a previous prototype,
6493 set the DECL_ARG_TYPE of each argument according to
6494 the type previously specified, and report any mismatches. */
6496 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6499 for (parm = DECL_ARGUMENTS (fndecl),
6500 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6501 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6502 != void_type_node));
6503 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6505 if (parm == 0 || type == 0
6506 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6508 error ("number of arguments doesn't match prototype");
6509 error_with_file_and_line (current_function_prototype_file,
6510 current_function_prototype_line,
6511 "prototype declaration");
6514 /* Type for passing arg must be consistent with that
6515 declared for the arg. ISO C says we take the unqualified
6516 type for parameters declared with qualified type. */
6517 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6518 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6520 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6521 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6523 /* Adjust argument to match prototype. E.g. a previous
6524 `int foo(float);' prototype causes
6525 `int foo(x) float x; {...}' to be treated like
6526 `int foo(float x) {...}'. This is particularly
6527 useful for argument types like uid_t. */
6528 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6530 if (PROMOTE_PROTOTYPES
6531 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6532 && TYPE_PRECISION (TREE_TYPE (parm))
6533 < TYPE_PRECISION (integer_type_node))
6534 DECL_ARG_TYPE (parm) = integer_type_node;
6538 pedwarn ("promoted argument `%s' doesn't match prototype",
6539 IDENTIFIER_POINTER (DECL_NAME (parm)));
6540 warning_with_file_and_line
6541 (current_function_prototype_file,
6542 current_function_prototype_line,
6543 "prototype declaration");
6548 error ("argument `%s' doesn't match prototype",
6549 IDENTIFIER_POINTER (DECL_NAME (parm)));
6550 error_with_file_and_line (current_function_prototype_file,
6551 current_function_prototype_line,
6552 "prototype declaration");
6556 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6559 /* Otherwise, create a prototype that would match. */
6563 tree actual = 0, last = 0, type;
6565 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6567 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6569 TREE_CHAIN (last) = type;
6574 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6576 TREE_CHAIN (last) = type;
6580 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6581 of the type of this function, but we need to avoid having this
6582 affect the types of other similarly-typed functions, so we must
6583 first force the generation of an identical (but separate) type
6584 node for the relevant function type. The new node we create
6585 will be a variant of the main variant of the original function
6588 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6590 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6593 /* Now store the final chain of decls for the arguments
6594 as the decl-chain of the current lexical scope.
6595 Put the enumerators in as well, at the front so that
6596 DECL_ARGUMENTS is not modified. */
6598 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6601 /* Make sure the binding level for the top of the function body
6602 gets a BLOCK if there are any in the function.
6603 Otherwise, the dbx output is wrong. */
6605 keep_next_if_subblocks = 1;
6607 /* ??? This might be an improvement,
6608 but needs to be thought about some more. */
6610 keep_next_level_flag = 1;
6613 /* Write a record describing this function definition to the prototypes
6614 file (if requested). */
6616 gen_aux_info_record (fndecl, 1, 0, prototype);
6618 /* Initialize the RTL code for the function. */
6619 init_function_start (fndecl, input_filename, lineno);
6621 /* Begin the statement tree for this function. */
6622 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6624 /* If this is a nested function, save away the sizes of any
6625 variable-size types so that we can expand them when generating
6631 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6632 = nreverse (get_pending_sizes ());
6633 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6636 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6639 /* This function is being processed in whole-function mode. */
6640 cfun->x_whole_function_mode_p = 1;
6642 /* Even though we're inside a function body, we still don't want to
6643 call expand_expr to calculate the size of a variable-sized array.
6644 We haven't necessarily assigned RTL to all variables yet, so it's
6645 not safe to try to expand expressions involving them. */
6646 immediate_size_expand = 0;
6647 cfun->x_dont_save_pending_sizes_p = 1;
6649 warn_shadow = saved_warn_shadow;
6652 /* Finish up a function declaration and compile that function
6653 all the way to assembler language output. The free the storage
6654 for the function definition.
6656 This is called after parsing the body of the function definition.
6658 NESTED is nonzero if the function being finished is nested in another.
6659 CAN_DEFER_P is nonzero if the function may be deferred. */
6662 finish_function (nested, can_defer_p)
6666 tree fndecl = current_function_decl;
6669 /* This caused &foo to be of type ptr-to-const-function which then
6670 got a warning when stored in a ptr-to-function variable. */
6671 TREE_READONLY (fndecl) = 1;
6675 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6677 /* Must mark the RESULT_DECL as being in this function. */
6679 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6681 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6683 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6684 != integer_type_node)
6686 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6687 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6689 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6693 #ifdef DEFAULT_MAIN_RETURN
6694 /* Make it so that `main' always returns success by default. */
6695 DEFAULT_MAIN_RETURN;
6698 c_expand_return (integer_zero_node);
6703 finish_fname_decls ();
6705 /* Tie off the statement tree for this function. */
6706 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6708 /* Complain if there's just no return statement. */
6709 if (warn_return_type
6710 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6711 && !current_function_returns_value && !current_function_returns_null
6712 /* Don't complain if we abort. */
6713 && !current_function_returns_abnormally
6714 /* Don't warn for main(). */
6715 && !MAIN_NAME_P (DECL_NAME (fndecl))
6716 /* Or if they didn't actually specify a return type. */
6717 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6718 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6719 inline function, as we might never be compiled separately. */
6720 && DECL_INLINE (fndecl))
6721 warning ("no return statement in function returning non-void");
6723 /* Clear out memory we no longer need. */
6724 free_after_parsing (cfun);
6725 /* Since we never call rest_of_compilation, we never clear
6726 CFUN. Do so explicitly. */
6727 free_after_compilation (cfun);
6732 /* Generate RTL for the body of this function. */
6733 c_expand_body (fndecl, nested, can_defer_p);
6735 /* Let the error reporting routines know that we're outside a
6736 function. For a nested function, this value is used in
6737 c_pop_function_context and then reset via pop_function_context. */
6738 current_function_decl = NULL;
6742 /* Generate the RTL for a deferred function FNDECL. */
6745 c_expand_deferred_function (fndecl)
6748 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6749 function was deferred, e.g. in duplicate_decls. */
6750 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6752 c_expand_body (fndecl, 0, 0);
6753 current_function_decl = NULL;
6757 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6758 then we are already in the process of generating RTL for another
6759 function. If can_defer_p is zero, we won't attempt to defer the
6760 generation of RTL. */
6763 c_expand_body (fndecl, nested_p, can_defer_p)
6765 int nested_p, can_defer_p;
6767 int uninlinable = 1;
6769 /* There's no reason to do any of the work here if we're only doing
6770 semantic analysis; this code just generates RTL. */
6771 if (flag_syntax_only)
6774 if (flag_inline_trees)
6776 /* First, cache whether the current function is inlinable. Some
6777 predicates depend on cfun and current_function_decl to
6778 function completely. */
6779 timevar_push (TV_INTEGRATION);
6780 uninlinable = ! tree_inlinable_function_p (fndecl);
6782 if (! uninlinable && can_defer_p
6783 /* Save function tree for inlining. Should return 0 if the
6784 language does not support function deferring or the
6785 function could not be deferred. */
6786 && defer_fn (fndecl))
6788 /* Let the back-end know that this function exists. */
6789 (*debug_hooks->deferred_inline_function) (fndecl);
6790 timevar_pop (TV_INTEGRATION);
6794 /* Then, inline any functions called in it. */
6795 optimize_inline_calls (fndecl);
6796 timevar_pop (TV_INTEGRATION);
6799 timevar_push (TV_EXPAND);
6803 /* Make sure that we will evaluate variable-sized types involved
6804 in our function's type. */
6805 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6806 /* Squirrel away our current state. */
6807 push_function_context ();
6810 /* Initialize the RTL code for the function. */
6811 current_function_decl = fndecl;
6812 input_filename = DECL_SOURCE_FILE (fndecl);
6813 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6815 /* This function is being processed in whole-function mode. */
6816 cfun->x_whole_function_mode_p = 1;
6818 /* Even though we're inside a function body, we still don't want to
6819 call expand_expr to calculate the size of a variable-sized array.
6820 We haven't necessarily assigned RTL to all variables yet, so it's
6821 not safe to try to expand expressions involving them. */
6822 immediate_size_expand = 0;
6823 cfun->x_dont_save_pending_sizes_p = 1;
6825 /* If this is a varargs function, inform function.c. */
6826 if (c_function_varargs)
6829 /* Set up parameters and prepare for return, for the function. */
6830 expand_function_start (fndecl, 0);
6832 /* If this function is `main', emit a call to `__main'
6833 to run global initializers, etc. */
6834 if (DECL_NAME (fndecl)
6835 && MAIN_NAME_P (DECL_NAME (fndecl))
6836 && DECL_CONTEXT (fndecl) == NULL_TREE)
6837 expand_main_function ();
6839 /* Generate the RTL for this function. */
6840 expand_stmt (DECL_SAVED_TREE (fndecl));
6843 /* Allow the body of the function to be garbage collected. */
6844 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6847 /* We hard-wired immediate_size_expand to zero above.
6848 expand_function_end will decrement this variable. So, we set the
6849 variable to one here, so that after the decrement it will remain
6851 immediate_size_expand = 1;
6853 /* Allow language dialects to perform special processing. */
6854 if (lang_expand_function_end)
6855 (*lang_expand_function_end) ();
6857 /* Generate rtl for function exit. */
6858 expand_function_end (input_filename, lineno, 0);
6860 /* If this is a nested function, protect the local variables in the stack
6861 above us from being collected while we're compiling this function. */
6863 ggc_push_context ();
6865 /* Run the optimizers and output the assembler code for this function. */
6866 rest_of_compilation (fndecl);
6868 /* Undo the GC context switch. */
6872 /* With just -W, complain only if function returns both with
6873 and without a value. */
6875 && current_function_returns_value
6876 && current_function_returns_null)
6877 warning ("this function may return with or without a value");
6879 /* If requested, warn about function definitions where the function will
6880 return a value (usually of some struct or union type) which itself will
6881 take up a lot of stack space. */
6883 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6885 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6887 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6888 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6889 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6892 unsigned int size_as_int
6893 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6895 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6896 warning_with_decl (fndecl,
6897 "size of return value of `%s' is %u bytes",
6900 warning_with_decl (fndecl,
6901 "size of return value of `%s' is larger than %d bytes",
6906 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6907 && ! flag_inline_trees)
6909 /* Stop pointing to the local nodes about to be freed.
6910 But DECL_INITIAL must remain nonzero so we know this
6911 was an actual function definition.
6912 For a nested function, this is done in c_pop_function_context.
6913 If rest_of_compilation set this to 0, leave it 0. */
6914 if (DECL_INITIAL (fndecl) != 0)
6915 DECL_INITIAL (fndecl) = error_mark_node;
6917 DECL_ARGUMENTS (fndecl) = 0;
6920 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6922 if (targetm.have_ctors_dtors)
6923 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6924 DEFAULT_INIT_PRIORITY);
6926 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6929 if (DECL_STATIC_DESTRUCTOR (fndecl))
6931 if (targetm.have_ctors_dtors)
6932 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6933 DEFAULT_INIT_PRIORITY);
6935 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6939 /* Return to the enclosing function. */
6940 pop_function_context ();
6941 timevar_pop (TV_EXPAND);
6944 /* Check the declarations given in a for-loop for satisfying the C99
6947 check_for_loop_decls ()
6953 /* If we get here, declarations have been used in a for loop without
6954 the C99 for loop scope. This doesn't make much sense, so don't
6956 error ("`for' loop initial declaration used outside C99 mode");
6959 /* C99 subclause 6.8.5 paragraph 3:
6961 [#3] The declaration part of a for statement shall only
6962 declare identifiers for objects having storage class auto or
6965 It isn't clear whether, in this sentence, "identifiers" binds to
6966 "shall only declare" or to "objects" - that is, whether all identifiers
6967 declared must be identifiers for objects, or whether the restriction
6968 only applies to those that are. (A question on this in comp.std.c
6969 in November 2000 received no answer.) We implement the strictest
6970 interpretation, to avoid creating an extension which later causes
6973 for (t = gettags (); t; t = TREE_CHAIN (t))
6975 if (TREE_PURPOSE (t) != 0)
6977 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6979 if (code == RECORD_TYPE)
6980 error ("`struct %s' declared in `for' loop initial declaration",
6981 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6982 else if (code == UNION_TYPE)
6983 error ("`union %s' declared in `for' loop initial declaration",
6984 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6986 error ("`enum %s' declared in `for' loop initial declaration",
6987 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6991 for (t = getdecls (); t; t = TREE_CHAIN (t))
6993 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6994 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6995 else if (TREE_STATIC (t))
6996 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6997 else if (DECL_EXTERNAL (t))
6998 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
7002 /* Save and restore the variables in this file and elsewhere
7003 that keep track of the progress of compilation of the current function.
7004 Used for nested functions. */
7006 struct language_function GTY(())
7008 struct c_language_function base;
7010 tree shadowed_labels;
7013 int returns_abnormally;
7014 int warn_about_return_type;
7016 struct binding_level *binding_level;
7019 /* Save and reinitialize the variables
7020 used during compilation of a C function. */
7023 c_push_function_context (f)
7026 struct language_function *p;
7027 p = ((struct language_function *)
7028 ggc_alloc (sizeof (struct language_function)));
7031 p->base.x_stmt_tree = c_stmt_tree;
7032 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7033 p->named_labels = named_labels;
7034 p->shadowed_labels = shadowed_labels;
7035 p->returns_value = current_function_returns_value;
7036 p->returns_null = current_function_returns_null;
7037 p->returns_abnormally = current_function_returns_abnormally;
7038 p->warn_about_return_type = warn_about_return_type;
7039 p->extern_inline = current_extern_inline;
7040 p->binding_level = current_binding_level;
7043 /* Restore the variables used during compilation of a C function. */
7046 c_pop_function_context (f)
7049 struct language_function *p = f->language;
7052 /* Bring back all the labels that were shadowed. */
7053 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7054 if (DECL_NAME (TREE_VALUE (link)) != 0)
7055 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7056 = TREE_VALUE (link);
7058 if (DECL_SAVED_INSNS (current_function_decl) == 0
7059 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7061 /* Stop pointing to the local nodes about to be freed. */
7062 /* But DECL_INITIAL must remain nonzero so we know this
7063 was an actual function definition. */
7064 DECL_INITIAL (current_function_decl) = error_mark_node;
7065 DECL_ARGUMENTS (current_function_decl) = 0;
7068 c_stmt_tree = p->base.x_stmt_tree;
7069 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7070 named_labels = p->named_labels;
7071 shadowed_labels = p->shadowed_labels;
7072 current_function_returns_value = p->returns_value;
7073 current_function_returns_null = p->returns_null;
7074 current_function_returns_abnormally = p->returns_abnormally;
7075 warn_about_return_type = p->warn_about_return_type;
7076 current_extern_inline = p->extern_inline;
7077 current_binding_level = p->binding_level;
7082 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
7085 c_dup_lang_specific_decl (decl)
7088 struct lang_decl *ld;
7090 if (!DECL_LANG_SPECIFIC (decl))
7093 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7094 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7095 sizeof (struct lang_decl));
7096 DECL_LANG_SPECIFIC (decl) = ld;
7099 /* The functions below are required for functionality of doing
7100 function at once processing in the C front end. Currently these
7101 functions are not called from anywhere in the C front end, but as
7102 these changes continue, that will change. */
7104 /* Returns non-zero if the current statement is a full expression,
7105 i.e. temporaries created during that statement should be destroyed
7106 at the end of the statement. */
7109 stmts_are_full_exprs_p ()
7114 /* Returns the stmt_tree (if any) to which statements are currently
7115 being added. If there is no active statement-tree, NULL is
7119 current_stmt_tree ()
7121 return &c_stmt_tree;
7124 /* Returns the stack of SCOPE_STMTs for the current function. */
7127 current_scope_stmt_stack ()
7129 return &c_scope_stmt_stack;
7132 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7136 anon_aggr_type_p (node)
7137 tree node ATTRIBUTE_UNUSED;
7142 /* Dummy function in place of callback used by C++. */
7145 extract_interface_info ()
7149 /* Return a new COMPOUND_STMT, after adding it to the current
7153 c_begin_compound_stmt ()
7157 /* Create the COMPOUND_STMT. */
7158 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7163 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7167 c_expand_decl_stmt (t)
7170 tree decl = DECL_STMT_DECL (t);
7172 /* Expand nested functions. */
7173 if (TREE_CODE (decl) == FUNCTION_DECL
7174 && DECL_CONTEXT (decl) == current_function_decl
7175 && DECL_SAVED_TREE (decl))
7176 c_expand_body (decl, /*nested_p=*/1, /*can_defer_p=*/0);
7179 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7180 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7183 identifier_global_value (t)
7186 return IDENTIFIER_GLOBAL_VALUE (t);
7189 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7190 otherwise the name is found in ridpointers from RID_INDEX. */
7193 record_builtin_type (rid_index, name, type)
7200 id = ridpointers[(int) rid_index];
7202 id = get_identifier (name);
7203 pushdecl (build_decl (TYPE_DECL, id, type));
7206 /* Build the void_list_node (void_type_node having been created). */
7208 build_void_list_node ()
7210 tree t = build_tree_list (NULL_TREE, void_type_node);
7214 /* Return something to represent absolute declarators containing a *.
7215 TARGET is the absolute declarator that the * contains.
7216 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
7217 to apply to the pointer type, represented as identifiers, possible mixed
7220 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
7221 if attributes are present) and whose type is the modifier list. */
7224 make_pointer_declarator (type_quals_attrs, target)
7225 tree type_quals_attrs, target;
7228 tree itarget = target;
7229 split_specs_attrs (type_quals_attrs, &quals, &attrs);
7230 if (attrs != NULL_TREE)
7231 itarget = tree_cons (attrs, target, NULL_TREE);
7232 return build1 (INDIRECT_REF, quals, itarget);
7235 #include "gt-c-decl.h"